Conditions are great, but sometimes you don't actually need them. Perhaps

someone is writing an integration with a chat service where they don't actually

care to limit which items get posted. Or an automatic review tool which should

run against all review requests, no matter what.
This change adds a new "Always match" mode to ConditionSet. When this is

chosen, the conditions list is hidden entirely, and the condition set will

always evaluate as matching.
This also contains a small fix to allow the condition form to load even when

the default value is empty (None).

Ran unit tests.
Used this in conjunction with a test integration.