1.6.1dev: fix // entry listed wrongly in the autocomplete menu in d…

…iff view when the repository's name is configured to empty (refs #13802)

git-svn-id: http://trac.edgewall.org/intertrac/log:/branches/1.6-stable@17865 af82e41b-90c4-0310-8c96-b1721e28e2e2

trac/versioncontrol/web_ui/changeset.py

@@ -1189,7 +1189,8 @@ def kind_order(entry):
             if not reponame:
                 entries.extend((True, repos.reponame, '/' + repos.reponame)
                                for repos in rm.get_real_repositories()
-                               if repos.is_viewable(req.perm))
+                               if repos.reponame and
+                                  repos.is_viewable(req.perm))
 
             paths = [{'label': path + ('/' if isdir else ''), 'value': path,
                       'isdir': isdir}