Yeah, solid state amps are fine without a load.Amps are only strained when they have a load. An open condition is like an infinite resistor to them. All voltage, no current.
The trepidation people have about this was born in the tube amp days, where the no load condition was a real no-no. The output transformers on the tube amplifiers required a low impedance load. Without it, the transformer could easily overheat and melt the windings.