DM-42324: Make sure bands exist in DCR subfilter registration test. #876
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It shouldn't be possible to register a subfilter that references a band that doesn't exist; this is a variant of DM-40818.
If one does manage to register such a subfilter, querying for it with a band constraint (as the CLI script does) is ill-defined - should it return no records since the band does not exist? Or should it return the referencing subfilter recoreds anyway? The previous test assumed the latter, but changes to daf_butler on this ticket are changing the behavior to the former. Registering the band (by registering an instrument and hence some physical_filters) first here avoids that ill-defined behavior, and it should make this test continue to work when DM-40818 is done.