Fix subversion markup view

* lib/viewcvs.py
  (view_markup):
    set annotate_href value

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git-svn-id: http://viewvc.tigris.org/svn/viewvc/trunk@1005 8cb11bc2-c004-0410-86c3-e597b4017df7

lib/viewcvs.py

@@ -1294,6 +1294,8 @@ def view_markup(request):
     data['annotate_href'] = request.get_url(view_func=view_annotate,
                                             params={'annotate': rev},
                                             escape=1)
+  else:
+    data['annotate_href'] = None
 
   if cfg.options.show_log_in_markup:
     options = {}