D13848: Fix device label with unknown size

[Kai Uwe Broulik]

broulik created this revision.
broulik added a reviewer: davidedmundson.
Restricted Application added a project: Frameworks.
Restricted Application added a subscriber: kde-frameworks-devel.
broulik requested review of this revision.

REVISION SUMMARY
  `size_str` can never actually become empty as `formatByteSize` returns "0 B" and never an empty string.

TEST PLAN
  Made it pretend my hard drive had 0 byte size, used to show "0 B Hard Drive", now it just shows "Hard Drive" as intended

REPOSITORY
  R245 Solid

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

AFFECTED FILES
  src/solid/devices/backends/udisks2/udisksdevice.cpp

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