Item14549: Prevent User/WikiName cache pollution by faulty call of internal user api.

When Foswiki::Users::getWikiName() is called with an unknown wikiname for a cUID, will it still set the internal caches. That's causing problems when foreign content is imported to Foswiki and/or the user mapping changes while old content is still being used that has been created with a previous mapping. The effect is that the cache is polluted by old topic revisions, and from there on getWikiName() stops working properly even for newly created content created.

-- MichaelDaum - 01 Dec 2017

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