Fixed linting problems.

Author: ontowhee

.TRACFREEZE.txt

@@ -102,6 +102,7 @@ trac.wiki.web_api.wikirenderer
 trac.wiki.web_ui.defaultwikipolicy
 tracdjangoplugin.plugins.customnavigationbar
 tracdjangoplugin.plugins.customnewticket
+tracdjangoplugin.plugins.customsubnavigationbar
 tracdjangoplugin.plugins.customtheme
 tracdjangoplugin.plugins.customwikimodule
 tracdjangoplugin.plugins.githubbrowserwithsvnchangesets

DjangoPlugin/tracdjangoplugin/plugins.py

@@ -147,10 +147,10 @@ def get_active_navigation_item(self, req):
         return ""
 
     def _get_active_class(self, active_item, subnav_name):
-        return 'active' if active_item == subnav_name else None
+        return "active" if active_item == subnav_name else None
 
     def get_navigation_items(self, req):
-        if req.path_info.startswith('/query'):
+        if req.path_info.startswith("/query"):
             active_item = self.get_active_navigation_item(req)
             return [
                 (