Review Request: Fix a crash on loading an engine that doesn't exist

[Zack Rusin]

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http://mattr.info/r/207/
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Review request for Plasma.


Summary
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When trying to load an engine that doesn't exist we crash. Fix it.


Diffs
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  /srv/kde/mirror/trunk/KDE/kdebase/workspace/libs/plasma/dataenginemanager.cpp

Diff: http://mattr.info/r/207/diff


Testing
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Thanks,

Zack