QmlProfiler: Guard against the temporary trace file going away
If we cannot open a temporary file to cache a trace or retrieve a
previously cached trace, the QML profiler won't work correctly. Show
an error in this case.
Change-Id: I468d74d9c33033b9ad19501bccbd69a9fe164fed
Reviewed-by:
Christian Kandeler <christian.kandeler@qt.io>
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