Return the exit code to QgisUntwine in case of no error message but no clean exit #159
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In the -hopefully rare- case that untwine crashes there is no error show to the user in QGIS (see qgis/QGIS#48307)
I wonder if this is a good approach to tackle this, by propagating the exit code from the untwine process to the
QgisUntwine::errorMessage
...