enable publish 1st draft on save, when no changes

This change allows a draft version to be published from edit screen without having to make any changes.

Current problem to be fixed by this change:
- save item as draft.
- return to edit screen.
- attempt to save as published
==>  failure: no change, block remains in draft state.
- return to edit screen
- edit any field
- attempt to save as published
==> success