Refactor proxy handling in api_decrypt.py to use an empty string instead of None for improved consistency; update returned_keys check to compare against an empty string for better error handling.

custom_functions/decrypt/api_decrypt.py

@@ -314,8 +314,8 @@ def api_decrypt(
         }
 
     # Prepare proxies
-    proxies = None
-    if proxy is not None:
+    proxies = ""
+    if proxy != "":
         is_url, protocol, fqdn = is_url_and_split(proxy)
         if is_url:
             proxies = {"http": proxy, "https": proxy}
@@ -380,7 +380,7 @@ def api_decrypt(
         json_data,
         is_widevine=(not is_pr),
     )
-    if returned_keys is None:
+    if returned_keys == "":
         return {"status": "error", "message": key_err}
 
     # Close session