> Hi Maurice,
> My main problem is when I want to close a ticket I must enter some text in body of it.
> Is there any way to get rid of this?

Yes, in the sysconfig there is a way to disable the requirement of text in the message. I remember this being discussed and resolved sometime ago. I do not remember the exact solution.
 
I do know that you can change the default body from <blank> to <space> in the sysconfig.