Review Request: Do not copy or move keys that don't actually exist

[Albert Astals Cid]

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http://git.reviewboard.kde.org/r/106906/
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Review request for kdelibs and David Faure.


Description
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When running kconf_update, if a source key does not exist it was creating a destination one with an empty string, which is totally wrong. This patch skips copyOrMove to do anything if the source key does not exist


Diffs
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  kconf_update/kconf_update.cpp 1bea77f 
  kconf_update/tests/test_kconf_update.cpp de14edb 

Diff: http://git.reviewboard.kde.org/r/106906/diff/


Testing
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Ran okular migration script successfully
added unittest


Thanks,

Albert Astals Cid

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