Fixed unassigned var

Author: Seluj78

backend/PyMatcha/routes/api/search.py

@@ -78,6 +78,7 @@ def search():
             if max_distance != -1:
                 raise BadRequestError("user needs to sets his location first")
 
+        common_tags = []
         if tags:
             user_tags = [t.name for t in user.get_tags()]
             common_tags = _get_common_tags(tags, user_tags)