You can find a lot of arguments about springs in compression taking a "set". I happen to believe that it would be unlikely in the case of a firing-pin spring. There would be no effect on the pin itself.
An occasional use of the trigger to "fire" the gun with an empty chamber should not harm anything. It is the possible great number of repetitions which could break something. A once-fired case would serve as well as a snap-cap for your described situation...You could just as well have the fired case in the chamber, as have it empty.
FWIW, Art
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