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Handle bugzilla whiteboard empty
Due to security reasons, "whiteboard" in bugzillas is now empty.
Get the information about the severity from the "bug_severity"
instead of "status_whiteboard".
Also the affected packages are now unknown. In this case let's
just return an empty list, that will be handled in
freshmaker/handlers/koji/rebuild_images_on_rpm_advisory_change.py
where all RPMs will be rebuilt.
ref: FACTORY-5074
Signed-off-by: gnaponie <gnaponie@redhat.com>