If no user is typing (currentRoom.userseTyping.length == 0) then don't
generate the "is typing" string. Because the message box is invisible.
This prefents error messages like:
```
kf.i18n: "1 instead of 2 arguments to message {%2 are typing} supplied before conversion."
```
Fixes: https://invent.kde.org/network/neochat/-/issues/80