A matcher leaf that decided a rejection, described for an operator: a route matcher's that failed, or a cross-route rule's that matched.
Under a none group: the condition matched, and that is what fails.
none
The cross-route rule whose matcher leaves this entity off an id list, so the page can link its editor; null when that edit is not the fix.
Optional
A matcher leaf that decided a rejection, described for an operator: a route matcher's that failed, or a cross-route rule's that matched.