Fixed No overlay at "Start New Conversation"

[Vincent]

If you forgot to add something in a normal thread, an overlay will show saying "Please enter the title/content"

If you forget something in the conversation it also shows "Please enter the participants/title/content", but it's not in an overlay.

It's not as designed I think?

 

[Kier]

In fact this is working as designed, but it's a trivial change to make it act like the new thread system, so I have done that.