Return true if this range has any room in it.

def isOpen(self):
        """ Return true if this range has any room in it.
        """
        if self.leftedge and self.rightedge and self.leftedge > self.rightedge:
            return False
    
        if self.leftedge == self.rightedge:
            if self.leftop is gt or self.rightop is lt:
                return False

        return True