fix actions check for < Python2.6

Author: Richard Jones

roundup/cgi/client.py

@@ -742,7 +742,7 @@ def check_anonymous_access(self):
             action = ''
         if isinstance(action, list):
             raise SeriousError('broken form: multiple @action values submitted')
-        elif action:
+        elif action != '':
             action = action.value.lower()
         if action in ('login', 'register'):
             return