[Branch View] show "New Pull Request" Button only if posible (#7977)

* add check Commits Ahead is gt 0

* code format
to start drone-ci test again
and formate code is also nice :)

templates/repo/graph.tmpl

@@ -2,8 +2,6 @@
 <div class="repository commits">
 	{{template "repo/header" .}}
 	<div class="ui container">
-
-
 	  <div id="git-graph-container" class="ui segment">
 		  <h1>{{.i18n.Tr "repo.commit_graph"}}</h1>
 	    <div id="rel-container">
@@ -37,9 +35,6 @@
 	      </ul>
 	    </div>
 	  </div>
-
-
-
 	</div>
 </div>
 {{template "base/footer" .}}