D25623: Fix crash when cups returns jobs with duplicate id

[Albert Astals Cid]

aacid added subscribers: kmaterka, nicolasfella, broulik.

REPOSITORY
  R363 Print Manager

REVISION DETAIL
  https://phabricator.kde.org/D25623

To: aacid, dantti
Cc: broulik, nicolasfella, kmaterka, kde-utils-devel
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