Fix PEP8 issues

tests/functional/openlp_core_lib/test_image_manager.py

@@ -171,4 +171,4 @@ class TestImageManager(TestCase, TestMixin):
         self.lock.release()
         # The sleep time is adjusted in the test case.
         time.sleep(self.sleep_time)
-        return ''
+        return ''

tests/functional/openlp_core_ui/test_media.py

@@ -125,4 +125,4 @@ class TestMedia(TestCase, TestMixin):
 
             # THEN: the used_players should be an empty list, and the overridden player should be an empty string
             self.assertEqual(['vlc', 'webkit', 'phonon'], used_players, 'Used players should be correct')
-            self.assertEqual('vlc,webkit,phonon', overridden_player, 'Overridden player should be a string of players')
+            self.assertEqual('vlc,webkit,phonon', overridden_player, 'Overridden player should be a string of players')

tests/functional/openlp_plugins/songs/test_opensongimport.py

@@ -95,7 +95,7 @@ class TestOpenSongImport(TestCase):
                 # THEN: do_import should return none and the progress bar maximum should not be set.
                 self.assertIsNone(importer.do_import(), 'do_import should return None when import_source is not a list')
                 self.assertEqual(mocked_import_wizard.progress_bar.setMaximum.called, False,
-                                  'setMaximum on import_wizard.progress_bar should not have been called')
+                                 'setMaximum on import_wizard.progress_bar should not have been called')
 
     def valid_import_source_test(self):
         """