remove unused element

Author: wxiaoguang

templates/repo/issue/view_content.tmpl

@@ -168,10 +168,6 @@
 {{template "repo/issue/view_content/reference_issue_dialog" .}}
 {{template "shared/user/block_user_dialog" .}}
 
-<div class="tw-hidden" id="no-content">
-	<span class="no-content">{{ctx.Locale.Tr "repo.issues.no_content"}}</span>
-</div>
-
 <div class="ui g-modal-confirm delete modal">
 	<div class="header">
 		{{svg "octicon-trash"}}