QtIFW

Silence warning in case the file does not exist.

Special case here was that the file was already removed by the
repositories meta info job, since now all files are held inside
the generated folder hierarchy. Before all downloaded files where
loosely held inside the tmp directory and the archives job had
to track them.

Change-Id: I8825cc4a7a569d1cf09198cb41834396fc1f1903
Reviewed-by: Niels Weber <niels.2.weber@nokia.com>
Reviewed-by: Tim Jenssen <tim.jenssen@nokia.com>