Canont unset post-specific revisions override

Following !3 (merged), casting the post-level limit to an integer prevents an empty value from unsetting the override. Before casting, a strlen check should be performed.

changed milestone to %v1.3

mentioned in commit e6b538d7

closed via commit e6b538d7

mentioned in commit 7b5f845a

closed via merge request !4 (merged)