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