Check if server action used in a thread is actually defined in server

[hator]

This problem leads to generation of invalid Dedan code from Rybu code that is considered correct by Rybu
compiler.

To reproduce call in a thread a server action that was not defined in that server.

server S {
    { action } -> { return :ok }
}
var s = S () {};
thread T () {
    s.actionThatWasNotDefined();
}