When doing !rq (report quest) on a quest, the supporting text asks for the message to be blank. However, attempting to put strings after !rq like it requests will fail, and it responds with "Your message cannot be empty". If you only type in !rq into chat, it accepts it, saying that the report has been submitted. This is seen in the following image
This holds true when looking onto quest reports on titan.tf/quests, as only the empty messages are counted in the reported quests section, not any of the ones with words in them.