Lint fix

Author: cderici

juju/utils.py

@@ -383,10 +383,11 @@ def get_local_charm_base(series, channel_from_arg, charm_metadata,
 
     return baseCls(channel_for_base, os_name_for_base)
 
+
 def base_channel_to_series(channel):
-    """
+    """Returns the series string using the track inside the base channel
 
     :param str channel: is track/risk (e.g. 20.04/stable)
     :return: str series (e.g. focal)
     """
-    return get_version_series(origin.Channel.parse(channel).track)
+    return get_version_series(origin.Channel.parse(channel).track)