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	Ensure rejected push to refs/pull/index/head fails nicely (#11724)
A pre-receive hook that rejects pushes to refs/pull/index/head will cause a broken PR which causes an internal server error whenever it is viewed. This PR handles prevents the internal server error by handling non-existent pr heads and sends a flash error informing the creator there was a problem. Signed-off-by: Andrew Thornton <art27@cantab.net>
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				@ -430,6 +430,20 @@ func PrepareViewPullInfo(ctx *context.Context, issue *models.Issue) *git.Compare
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	sha, err := baseGitRepo.GetRefCommitID(pull.GetGitRefName())
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	if err != nil {
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		if git.IsErrNotExist(err) {
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			ctx.Data["IsPullRequestBroken"] = true
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			if pull.IsSameRepo() {
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				ctx.Data["HeadTarget"] = pull.HeadBranch
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			} else if pull.HeadRepo == nil {
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				ctx.Data["HeadTarget"] = "<deleted>:" + pull.HeadBranch
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			} else {
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				ctx.Data["HeadTarget"] = pull.HeadRepo.OwnerName + ":" + pull.HeadBranch
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			}
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			ctx.Data["BaseTarget"] = pull.BaseBranch
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			ctx.Data["NumCommits"] = 0
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			ctx.Data["NumFiles"] = 0
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			return nil
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		}
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		ctx.ServerError(fmt.Sprintf("GetRefCommitID(%s)", pull.GetGitRefName()), err)
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		return nil
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	}
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@ -464,12 +478,10 @@ func PrepareViewPullInfo(ctx *context.Context, issue *models.Issue) *git.Compare
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		ctx.Data["IsPullRequestBroken"] = true
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		if pull.IsSameRepo() {
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			ctx.Data["HeadTarget"] = pull.HeadBranch
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		} else if pull.HeadRepo == nil {
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			ctx.Data["HeadTarget"] = "<deleted>:" + pull.HeadBranch
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		} else {
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			if pull.HeadRepo == nil {
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				ctx.Data["HeadTarget"] = "<deleted>:" + pull.HeadBranch
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			} else {
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				ctx.Data["HeadTarget"] = pull.HeadRepo.OwnerName + ":" + pull.HeadBranch
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			}
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			ctx.Data["HeadTarget"] = pull.HeadRepo.OwnerName + ":" + pull.HeadBranch
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		}
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	}
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@ -952,6 +964,16 @@ func CompareAndPullRequestPost(ctx *context.Context, form auth.CreateIssueForm)
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		if models.IsErrUserDoesNotHaveAccessToRepo(err) {
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			ctx.Error(400, "UserDoesNotHaveAccessToRepo", err.Error())
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			return
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		} else if git.IsErrPushRejected(err) {
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			pushrejErr := err.(*git.ErrPushRejected)
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			message := pushrejErr.Message
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			if len(message) == 0 {
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				ctx.Flash.Error(ctx.Tr("repo.pulls.push_rejected_no_message"))
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			} else {
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				ctx.Flash.Error(ctx.Tr("repo.pulls.push_rejected", utils.SanitizeFlashErrorString(pushrejErr.Message)))
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			}
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			ctx.Redirect(ctx.Repo.RepoLink + "/pulls/" + com.ToStr(pullIssue.Index))
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			return
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		}
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		ctx.ServerError("NewPullRequest", err)
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		return
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@ -443,6 +443,16 @@ func PushToBaseRepo(pr *models.PullRequest) (err error) {
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		// Use InternalPushingEnvironment here because we know that pre-receive and post-receive do not run on a refs/pulls/...
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		Env: models.InternalPushingEnvironment(pr.Issue.Poster, pr.BaseRepo),
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	}); err != nil {
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		if git.IsErrPushOutOfDate(err) {
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			// This should not happen as we're using force!
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			log.Error("Unable to push PR head for %s#%d (%-v:%s) due to ErrPushOfDate: %v", pr.BaseRepo.FullName(), pr.Index, pr.BaseRepo, headFile, err)
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			return err
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		} else if git.IsErrPushRejected(err) {
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			rejectErr := err.(*git.ErrPushRejected)
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			log.Info("Unable to push PR head for %s#%d (%-v:%s) due to rejection:\nStdout: %s\nStderr: %s\nError: %v", pr.BaseRepo.FullName(), pr.Index, pr.BaseRepo, headFile, rejectErr.StdOut, rejectErr.StdErr, rejectErr.Err)
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			return err
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		}
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		log.Error("Unable to push PR head for %s#%d (%-v:%s) due to Error: %v", pr.BaseRepo.FullName(), pr.Index, pr.BaseRepo, headFile, err)
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		return fmt.Errorf("Push: %s:%s %s:%s %v", pr.HeadRepo.FullName(), pr.HeadBranch, pr.BaseRepo.FullName(), headFile, err)
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	}
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