#746 allow adding an AttributeBlob with is_null_allowed = true to an existing Data Model. (same issue fixed also for AttributeOneWayPassword).
#746 allow adding an AttributeBlob with is_null_allowed = true to an existing Data Model. (same issue fixed also for AttributeOneWayPassword).

ucbpi/itop,ucbpi/itop,ucbpi/itop,ucbpi/itop,ucbpi/itop