Switch it off and avoid repeating the mistake. A brief accidental start does not by itself establish damage, but neither does a normal-looking sink prove the appliance is unaffected.
What the observation tells you
Record whether food was present, how long it ran and whether there was an unusual sound, smell, stop or leak. Those details are more useful than running another dry test. Use the exact instructions to determine whether an owner check is appropriate before the next session.
A useful next step
If any abnormal symptom occurred, keep the unit unused and seek advice. Otherwise, resume only in accordance with the normal water and operating sequence.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.