https://bugzilla.wikimedia.org/show_bug.cgi?id=53299

--- Comment #1 from Umherirrender <umherirrender_de...@web.de> ---
A diff link between the current version as oldid and diff=next is showing the
one version on both side and the "no difference" in the middle, that is also
not a behaviour.

The empty string came from a "Short-circuit" where the oldRev is checked
against false (and if the revids between old and new the same).

No idea at the moment how to handle this rare case.

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