Looks up the action based on the inputed text.
        
        :return     <QAction> || None

def findAction( self, text ):
        """
        Looks up the action based on the inputed text.
        
        :return     <QAction> || None
        """
        for action in self.actionGroup().actions():
            if ( text in (action.objectName(), action.text()) ):
                return action
        return None