Nepomuk dependency is optional for dolphin but not for its tests

[Andriy Rysin]

When compiling kde-baseapps nepomuk is optional:
-----------------------------------------------------------------------------
-- The following OPTIONAL packages could NOT be located on your system.
-- Consider installing them to enable more features from this software.
-----------------------------------------------------------------------------
    * Nepomuk <http://www.kde.org>
      Nepomuk
...

But not when dolphin tests are considered:

CMake Error: The following variables are used in this project, but they 
are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the 
CMake files:
NEPOMUK_LIBRARIES (ADVANCED)
     linked by target "dolphinsearchboxtest" in directory 
/home/arysin/work/OSS/KDE/kde-baseapps/dolphin/src/tests
NEPOMUK_QUERY_LIBRARIES (ADVANCED)
     linked by target "dolphinsearchboxtest" in directory 
/home/arysin/work/OSS/KDE/kde-baseapps/dolphin/src/tests

We probably should adjust the dolphin tests

Regards,
Andriy