In a prosecution in which an actor's criminal responsibility is based on the conduct of another, the actor may be convicted on proof of commission of the offense and that he was a party to its commission, and it is no defense:
(1) that the actor belongs to a class of persons that by definition of the offense is legally incapable of committing the offense in an individual capacity; or
(2) that the person for whose conduct the actor is criminally responsible has been acquitted, has not been prosecuted or convicted, has been convicted of a different offense or of a different type or class of offense, or is immune from prosecution.