Delete Format without having to remove DescriptiveFormat from BDef

[nateiam]

As a Herd Publisher I want to delete a Format that is designated the DescriptiveFormat without removing it's designation in the BDef

Acceptance Criteria

• Format can be deleted even if it is designated as the DescriptiveFormat
• When a Format that is designated as DescriptiveFormat in the BDef is deleted, the designation in the BDef is automatically removed

Implementation Notes:

• When a format version is being deleted:
  • Select the relative business object definition - use the get method on the format entity for that
  • If business object definition has its descriptive format set to the format entity that is being deleted, then update the bdef by setting the descriptive format field to null