test for none proxy env

backend/stream.py

@@ -81,7 +81,9 @@ for key in providers:
         country = None
         pos = len(country_groups) - 1
         if pos >= 0:
-            country = country_groups[pos].strip("_")
+            country_temp = country_groups[pos]
+            if isinstance(country_temp, str):
+                country = country_temp.strip("_")
                 current_keys.add(f'{key}_{country}')
         proxy = os.environ.get(match)
         if proxy is not None: