misc: make sure redirect URLs are real strings

wcs/workflows.py

@@ -83,6 +83,11 @@ def perform_items(items, formdata, depth=20):
         # performs the items of the new status
         wf_status = formdata.get_status()
         url = perform_items(wf_status.items, formdata, depth=depth-1) or url
+    if url:
+        # hack around webtest as it checks type(url) is str and
+        # this won't work on django safe strings (isinstance would work);
+        # adding '' makes sure we get a "real" str object.
+        url = url + ''
     return url