[KPhotoAlbum] People and Locations categories not loaded anymore

[Tobias Leupold]

@Johannes:
> Could you please all check whether the fix in git master works for your
> database correctly?
I can't reproduce the problem with current git master and a compressed 
database anymore. I attached my minimal testing database for convenience.

@Robert:
> git master does *NOT* fix the problem.  I loaded a known good database
> and people and places were still missing.
Probably a problem with the "readable" db format. I'll investigate this!

Anyway, it's nice that we found this _before_ we did a release ;-)
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