PEP fixes

openlp/core/lib/exceptions.py

@@ -23,6 +23,7 @@
 The :mod:`~openlp.core.lib.exceptions` module contains custom exceptions
 """
 
+
 class ValidationError(Exception):
     """
     The :class:`~openlp.core.lib.exceptions.ValidationError` exception provides a custom exception for validating

tests/functional/openlp_core_ui/test_thememanager.py

@@ -166,7 +166,6 @@ class TestThemeManager(TestCase):
             mocked_getroot.return_value = MagicMock(**{'get.return_value': None})
             theme_manager = ThemeManager(None)
 
-
             # WHEN: unzip_theme is called
             theme_manager.unzip_theme('theme.file', 'folder')