When picking a host for transfer-image job, we filter hosts that
are UP and then process the data they reported on storage domains
without checking whether the host actually reported this data.
It can happen that hosts are UP and still have not reported data
on storage domains, in which case the data is null, resulting in
an NPE in the transfer-image flow.

This patch changes the predicate that is used to filter hosts for
transfer-image, adding a null-check to avoid that NPE.

Bug-Url: https://bugzilla.redhat.com/2203132
Signed-off-by: Arik Hadas <ahadas@redhat.com>

The call to ansible-lint is commented out until we fix it
Filed issue: oVirt#851

Signed-off-by: Arik Hadas <ahadas@redhat.com>