Worf didn't face any punishment because the Risians (bizarrely) don't consider his actions to have been inappropriate.
In their almost pathetic eagerness to please, they seem to be determined to brush his actions, which did, admittedly amount to little more than a practical joke, under the proverbial carpet.
ARANDIS: I hope the two of you will visit Risa again.
WORF: I did not think I'd be welcome.
ARANDIS: You still have a lot to learn about my people.
The fact that he subsequently saved the population from certain destruction almost certainly went some way toward improving his standing.
History doesn't record what action was taken against Fullerton and his Bolian accomplice but it can be reasonably assumed that their attempt to murder thousands of people was dealt with rather more harshly.