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Allow zero-length descriptions in both S:EF and standard edits

Description

Allow zero-length descriptions in both S:EF and standard edits

This removes the check for zero length when inserting
to External Store, and a similar check in Special:EnableFlow.

Related i18n changes

Bug: T108348
Change-Id: Ie409962f27e2cd5b8d1f8fde579c7536195a8020