First off, the garbage disposal receptacle is switched. Did you flip on the switch when tring the dishwasher?
All signs are that the receptacle your DW was plugged into is dead. If for sure all circuit breakers are on ( find the one for the DW. Flip it all the way off, then back on. A tripped breaker is not always obvious to the eye.) If the breaker is ok, then there may be a loose wire at the receptacle, or elsewhere.