D13848: Fix device label with unknown size

[Stefan Brüns]

bruns added a comment.


  So the question is, on which occasion does solid return a size of 0?

REPOSITORY
  R245 Solid

REVISION DETAIL
  https://phabricator.kde.org/D13848

To: broulik, davidedmundson
Cc: bruns, kde-frameworks-devel, michaelh, ngraham