Lazy call router when replacing old backend paths #4091
Merged
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In #3995 we noticed the router was called for every old backend path even if it did not exist in the replaced URL. See https://github.com/contao/contao/pull/3995/files#r795530334 for the discussion.
This PR changes the behaviour to use the callback only when necessary, happily covered with some unit tests 馃槑