try to fix app_gw being null

passbook/app_gw/middleware.py

@@ -77,11 +77,11 @@ class ApplicationGatewayMiddleware:
         try:
             # Check if ApplicationGateway is associated with application
             getattr(app_gw, 'application')
+            if app_gw:
                 return False, app_gw
         except Application.DoesNotExist:
             LOGGER.debug("ApplicationGateway not associated with Application")
         return True, None
-        return True, None
 
     def __call__(self, request):
         forward, self.app_gw = self.precheck(request)