Review Request 129926: Add nullptr check to prevent possible crash when getting MusicBrianz tags

[Dominik Waurenschk]

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Review request for Amarok.


Repository: amarok


Description
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Possible fix/workaround for [bug 328359](https://bugs.kde.org/show_bug.cgi?id=328359)


Diffs
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  src/musicbrainz/MusicBrainzTagsModel.cpp 0ffb284055 

Diff: https://git.reviewboard.kde.org/r/129926/diff/


Testing
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Thanks,

Dominik Waurenschk

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