Prior to this change, if the entire product IDs SCM directory was missing, pungi would crash with an error.
For example, if "ceph-3" was missing from the SCM:
OSError: [Errno 2] No such file or directory: '/tmp/tmpMb9O6r/product_ids/ceph-3'
This occurred even if product_id_allow_missing was set to True.
Make product_id_allow_missing cover this case as well, and gracefully
skip all product IDs.
We now see the following warning in the logs instead:
[WARNING ] No product IDs in {'scm': 'git', 'repo': 'git://example.com/rcm/rcm-metadata.git', 'dir': 'product_ids/ceph-3'}
and the compose succeeds.
Signed-off-by: Ken Dreyer <kdreyer@redhat.com>
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