cubicweb #13973741 Broken data importers [validation pending]

Changeset 62a7100d774b breaks pre-dating data importers that created Binary themselves.

IMHO this deserves backward compatibilty.

prioritynormal
typebug
done in3.23.1
load left0.000
closed by#e148b384a782 [dataimport] Restore handling of Binary in ExtEntity's values
patch[dataimport] Restore handling of Binary in ExtEntity's values [applied]