projectsettings.cpp: return if open() fails
Fixes Coverity CID 709281: Unchecked return value (CHECKED_RETURN) Calling function "QFile::open(QFlags<QIODevice::OpenModeFlag>)" without checking return value (as is done elsewhere 45 out of 47 times). No check of the return value of "xmlf.open(QIODevice::OpenMode(_ZN9QIODevice9WriteOnlyE))". 552 xmlf.open(QIODevice::WriteOnly);
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0be5ff60
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