Review Request: Keep KService::createInstance error message in KServiceTypeTrader::createInstanceFromQuery

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This review has been submitted with commit c78c13973ab47a79dc0a515fb891d6328808344f by Milian Wolff to branch KDE/4.10.

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On Oct. 25, 2012, 12:12 a.m., Milian Wolff wrote:
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> (Updated Oct. 25, 2012, 12:12 a.m.)
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> Review request for kdelibs and David Faure.
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> Description
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> When KServiceTypeTrader::createInstanceFromQuery fails in KService::createInstance, the error message is currently overwritten by the useless information "No service matching the requirements was found". This patch fixes that to keep the error message set by KService::createInstance and thus give me something more useful like e.g. "Cannot load library /home/milian/projects/compiled/kde4/lib/kde4/kdevqmljslanguagesupport.so: (libqtc-qmlsupport.so: cannot open shared object file: No such file or directory)" ' 
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> Diffs
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>   kdecore/services/kservicetypetrader.h 8641fe6 
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> Diff: http://git.reviewboard.kde.org/r/107032/diff/
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> Testing
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> changed the header, ran KDevelop with invalid plugins, got actually useful output (see above). Another example that was overwritten as well before this patch:
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> "Cannot load library /home/milian/projects/compiled/kde4/lib/kde4/kdevfiletemplates.so: (/home/milian/projects/compiled/kde4/lib/kde4/kdevfiletemplates.so: undefined symbol: _ZTIN8KDevelop17ITemplateProviderE)" ' 
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> Thanks,
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> Milian Wolff
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