submodules of wis2downloader are not found in GH runner action, debug…

…ging.

wis2downloader/app.py

@@ -213,7 +213,8 @@ def get_subscription(topic):
 @app.delete('/subscriptions/<path:topic>')
 def delete_subscription(topic):
     topic = unquote(topic)
-
+    is_topic_valid = False
+    msg = None
     # Topic validation
     if CONFIG['validate_topics']:
         is_topic_valid, msg = validate_topic(topic)