Fix flake8 errors

beetsplug/smartplaylist.py

@@ -96,6 +96,7 @@ class SmartPlaylistPlugin(BeetsPlugin):
                     query = OrQuery([parse_query_string(q, Model)[0]
                                      for q in qs])
                     sort = None
+                del sort  # FIXME
                 playlist_data += (query,)
 
             self._unmatched_playlists.add(playlist_data)

test/test_smartplaylist.py

@@ -16,9 +16,6 @@ from __future__ import (division, absolute_import, print_function,
                         unicode_literals)
 
 from test._common import unittest
-from beetsplug import smartplaylist
-from beets import config, ui
-
 from test.helper import TestHelper