Make optional some fields in LivelihoodActivity sub-classes see HEA-596

Author: girumb

apps/baseline/tests/test_models.py

@@ -12,10 +12,7 @@
 from common.tests.factories import ClassifiedProductFactory
 from common.utils import conditional_logging
 
-from .factories import (
-    CommunityFactory,
-    WealthGroupCharacteristicValueFactory,
-)
+from .factories import CommunityFactory, WealthGroupCharacteristicValueFactory
 
 
 class WealthGroupCharacteristicValueTestCase(TestCase):