fix(project): prevent database mutations on invalid MoveIssues payload (#38600) (#38602)

Backport #38600

Signed-off-by: Sudhanshu Singh <sudhanshuwriterblc@gmail.com>
Co-authored-by: Shudhanshu Singh <sudhanshuwriterblc@gmail.com>

routers/web/repo/projects.go

@@ -742,6 +742,7 @@ func MoveIssues(ctx *context.Context) {
 	form := &movedIssuesForm{}
 	if err = json.NewDecoder(ctx.Req.Body).Decode(&form); err != nil {
 		ctx.ServerError("DecodeMovedIssuesForm", err)
+		return
 	}
 
 	issueIDs := make([]int64, 0, len(form.Issues))