fixed issue with sessions in db on GAE

applications/examples/static/css/stupid.css

@@ -317,7 +317,7 @@ a:not(.btn):not(.noeffect):after {
 .accordion>input {display:none}
 .accordion>input:checked ~ *:not(label) {
   max-height: 1000px !important;
-  overflow:visible !important;
+  overflow:hidden !important;
   -webkit-transition: max-height .3s ease-in;
   transition: max-height .3s ease-in;
 }

gluon/globals.py

@@ -1192,11 +1192,13 @@ class Session(Storage):
 
     def _try_store_in_file(self, request, response):
         try:
-            if (not response.session_id or self._forget
+            if (not response.session_id or 
+                not response.session_filename or
+                self._forget
                 or self._unchanged(response)):
                 # self.clear_session_cookies()
-                self.save_session_id_cookie()
                 return False
+            else:
                 if response.session_new or not response.session_file:
                     # Tests if the session sub-folder exists, if not, create it
                     session_folder = os.path.dirname(response.session_filename)
@@ -1209,11 +1211,10 @@ class Session(Storage):
                     session_pickled = response.session_pickled or pickle.dumps(self, pickle.HIGHEST_PROTOCOL)
                     response.session_file.write(session_pickled)
                     response.session_file.truncate()
+                return True
         finally:
             self._close(response)
-
             self.save_session_id_cookie()
-        return True
 
     def _unlock(self, response):
         if response and response.session_file and response.session_locked: