D11365: also test for value types in taglibextractortest and fix errors

[Alexander Stippich]

astippich added reviewers: Frameworks, Baloo.

REPOSITORY
  R286 KFileMetaData

REVISION DETAIL
  https://phabricator.kde.org/D11365

To: astippich, #frameworks, #baloo
Cc: #frameworks, ashaposhnikov, michaelh, spoorun, nicolasfella, ngraham, alexeymin
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