Fix flake8 again :)

tests/backend/localmongodb/test_queries.py

@@ -56,7 +56,7 @@ def test_write_assets():
 
     # check that 3 assets were written to the database
     cursor = conn.db.assets.find({}, projection={'_id': False})\
-                           .sort('id', pymongo.ASCENDING) 
+                           .sort('id', pymongo.ASCENDING)
 
     assert cursor.collection.count_documents({}) == 3
     assert list(cursor) == assets[:-1]

tests/commands/test_commands.py

@@ -11,7 +11,6 @@ from argparse import Namespace
 import pytest
 
 from bigchaindb import ValidatorElection
-from tests.conftest import node_keys
 
 
 def test_make_sure_we_dont_remove_any_command():