Fix link for patchset level comment

Link was removed because it is redundant, needed to update the .soy file.

Bug: Issue 12997
Change-Id: I4537115675d596883b1e97143151278aa79187b2
diff --git a/resources/com/google/gerrit/server/mail/CommentHtml.soy b/resources/com/google/gerrit/server/mail/CommentHtml.soy
index 534cbdb..617c8d17 100644
--- a/resources/com/google/gerrit/server/mail/CommentHtml.soy
+++ b/resources/com/google/gerrit/server/mail/CommentHtml.soy
@@ -111,7 +111,9 @@
     {for $group in $commentFiles}
       <li style="{$fileLiStyle}">
         <p>
-          <a href="{$group.link}">{$group.title}:</a>
+          {if $group.link}<a href="{$group.link}">{/if}
+          {$group.title}:
+          {if $group.link}</a>{/if}
         </p>
 
         <ul style="{$ulStyle}">