When creating a new discussion it is not obvious whether the Message can be left empty. There is no "*" as it is on the Subject.
Anyway, an empty Message is only trapped when using Firefox.
=> alert: Failed to create/edit discussion
Server responds with success and: ERROR:A forum id,subjec...ntent must be supplied.
When using Chrome/IE the Message is somehow not empty, even if I did not enter any text into the input field and thus there is no problem starting a discussion without Message content.