Fix E305 codestyle errors

Change-Id: Ied1474f1f07f2b565014956c314c690001d3d56d
Signed-off-by: Oleg Ovcharuk <vgvoleg@gmail.com>

mistral/db/sqlalchemy/migration/cli.py

@@ -138,5 +138,6 @@ def main():
     logging.setup(CONF, 'Mistral')
     CONF.command.func(config, CONF.command.name)
 
+
 if __name__ == '__main__':
     sys.exit(main())

mistral/tests/unit/engine/test_commands.py

@@ -360,6 +360,7 @@ class OrderEngineCommandsTest(base.EngineTestCase):
         self.await_task_error(task2_db.id)
         self.await_workflow_success(wf_ex.id)
 
+
 WORKBOOK4 = """
 ---
 version: '2.0'
@@ -449,6 +450,7 @@ class SimpleEngineCmdsWithMsgTest(base.EngineTestCase):
         self.assertEqual(states.PAUSED, wf_ex.state)
         self.assertEqual("my_var value is 3", wf_ex.state_info)
 
+
 WORKBOOK5 = """
 ---
 version: '2.0'