I would not think it would bother any modern amp to run without a load. If you are worried why not get a couple of resistors and connect them to the outputs? You are not feeding any signal to them so I don't see what good they will do outside of relieving worry. But that is a legitimate purpose. You should have been around in the old days when you could blow the output stage when the amp was unplugged. I have a feeling that that advice may have been directed at some of the more exotic circuit designs. Amps that run well into class A are a law unto themselves.
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