instead, silently ignore them - they typically stem from missing
repositories (usually, the obsolete ones).

Change-Id: Iaec00f8e88e4977bd820d1b8c3b5b8d5be30c72b
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>