Check the mailmap on every page it reaches

The MANUAL promises the blame and stats pages and says mailmap.file
and mailmap.blob are ignored, and none of it was tested. The summary,
where v2.11.1 fixed a mailmap crash, was never loaded, and neither was
a committer, a mailmap on another branch or the repository flag turning
the map on. The empty search checked only that nothing matched, and
one test appended to the shared config.

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