Configuring no properties results in a breaking 'nil' value, instead of an empty hash, for DynamicSchema.schema['properties']

[aploshay]

When a work class was configured to use AllinsonFlex with no properties configured, the resultant DynamicSchema object had a nil value, instead of an empty Hash, in the properties field of the schema attribute (serialized JSON). Granted, this is an odd situation you probably wouldn't want to create -- but other parts of the stack assume a valid Hash value is present there, and break. This includes the form to create new work not rendering.

You'll want a more elegant solution within allinson_flex, but there's a monkeypatch PR up for a project using allinson_flex, here:
IU-Libraries-Joint-Development/essi#292