Short answer: yes.
they're built to operate with a minimum amount of load on the rails (its not alot, usually between 0.3 to 1.0 A on the 12v , for example, average 0.5 for minimum).
each has different specs on that minimum amount (current related) but they do exist.
if you're setting one up with those components connected, i dont think you'll have issues.
(anyone else?).
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