fix panic when checking len on nil object

issue #7444 describes a problem where an image does not have a manifest file and cannot be processed by our library correctly.  the origin of the panic is because we are checking the len of a nil object's attribute.  this is a temporary fix to protect from the panic in the future.  the origin of the problem is more interesting and requires more work when the code author returns from pto.

Signed-off-by: Brent Baude <bbaude@redhat.com>

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