The cancel button in the modal for moderation actions (e.g. 'delete topic') is broken with a schema error.
|mediawiki/extensions/Flow : master||Make FlowReplies slightly work|
Checked in vagrant - Cancel action for moderation actions (delete, hide, supress) works.
For betalabs T135185: [betalabs] Flow: clicking 'Cancel' for moderation actions results in "Unknown dependency: schema.Undefined" error much less severe issue was filed.