comments for FlowPropertyValuePersister, FlowActivityPhase
allow AbstractFlowPropertyDefinitionProvider.getRequired() to be passed a null flowPropertyDefinition
move some hack code to register a FlowPropertyDefinitionProvider as a FlowValidationResultProvider up to base class.
remove unnecessary imports - to see real dependencies
A handy method to test strings for being blank.
Merge branch 'master' of git@github.com:/amplafi/amplafi-flow-core.git
Merge branch 'master' into v1.7