audiocreator: Check tag against null
In earlier versions of taglib it wasn't guaranteed that a "tag" existed when the respective "has" method returned true.
This can lead to null pointer access.
backport to stable pls
Edited by Kai Uwe Broulik
In earlier versions of taglib it wasn't guaranteed that a "tag" existed when the respective "has" method returned true.
This can lead to null pointer access.
backport to stable pls