Update app_rvc.py

app_rvc.py

@@ -340,7 +340,7 @@ class SoniTranslate(SoniTrCache):
         media_file_arg = kwargs[0] if kwargs[0] is not None else []
 
         link_media_arg = kwargs[1]
-        link_media_arg = [x.strip() for x in link_media_arg.split(',')]
+        link_media_arg = [x.strip() for x in (link_media_arg or '').split(',')]
         link_media_arg = get_link_list(link_media_arg)
 
         path_arg = kwargs[2]