Only redirect if correct action property of PermissionError exception

[Ryan J Ollos]

Suggested in ​trac:comment:13:ticket:11513:

permredirect/filter.py

@@ -24 +24 @@
                 return template, data, content_type
 
             exctype, exc = sys.exc_info()[0:2]
-            if issubclass(exctype, PermissionError):
+            if issubclass(exctype, PermissionError) and \
+                    exc.action and exc.action.isupper():
                 req.redirect(req.href.login())
 
             try: