Prevent looping when no closing parenthesis is found

[Loottoo]

The argumentsString variable builds up to extreme lengths when argumentClosing is -1 (no closing parenthesis).

Reproduce with code:

rule("Each Player Rule")
{
    event
    {
        Ongoing - Each Player;
        All;
        All;
    }

    conditions
    {

    }

    actions
    {
	    Apply Impulse(Event Player, Dot Product(Velocity Of(
	    Event Player), Normalize(X Component Of(Throttle))

        
    }
}