Triggers the connected dropzone slot at the inputed point.
        
        :param      point       | <QPointF>
                    connection  | <Connection>

def triggerDropzoneAt( self, point, connection ):
        """
        Triggers the connected dropzone slot at the inputed point.
        
        :param      point       | <QPointF>
                    connection  | <Connection>
        """
        dropzone = self.dropzoneAt(point)
        if dropzone:
            dropzone.slot()(connection)