Vocative and no comma

I have been observing this for a long time now. Many (most?) languages seem to be forgetting about the comma before a vocative, maybe because a lot of people equate commas with pauses and normally there is no pause before a vocative. What prompted me to write this piece was this sentence, seen on a message board on the French language, whose members are very strict with language. No one, though, seems to have noticed this error so far.