D12490: concatPaths: process empty path1 correctly

[Алексей Шилин]

aleksejshilin requested review of this revision.
aleksejshilin added a comment.


  Here is an example of KUrlCompletion breakage.
  Before, it returned invalid absolute paths like /Desktop etc.:
  F5820341: Before.png <https://phabricator.kde.org/F5820341>
  After:
  F5820340: After.png <https://phabricator.kde.org/F5820340>

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D12490

To: aleksejshilin, #frameworks
Cc: michaelh, bruns
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