[Kde-pim] [patch] a little kresources cleanup

[Jaroslaw Staniek]

[for review]
While inspecting the code in search of source of crash in incidences
like http://intevation.de/roundup/kolab/issue2631:

- use foreach where reasonable
- use QString::isEmpty() instead of QString::isNull()

-- 
regards / pozdrawiam, Jaroslaw Staniek
  Sponsored by OpenOffice Polska (http://www.openoffice.com.pl/en) to work on
  Kexi & KOffice (http://www.kexi.pl/en, http://www.koffice.org/kexi)
  KDE Libraries for MS Windows (http://windows.kde.org)
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