Issue #2779321 by nedjo, Akram Khan, smustgrave, catch, Meenakshi_j, pooja...
Issue #2779321 by nedjo, Akram Khan, smustgrave, catch, Meenakshi_j, pooja saraah, Berdir, alexpott: Submitting empty block layout form results in breakage for all block entities
(cherry picked from commit b5b29516)