Click when target exists
        Example usage:
            - click_exists("button.png")
            - click_exists(text="Update")

def click_exists(self, *args, **kwargs):
        """ Click when target exists
        Example usage:
            - click_exists("button.png")
            - click_exists(text="Update")
        """
        if len(args) > 0:
            return self.click_nowait(*args, **kwargs)
        else:
            elem = self(**kwargs)
            if elem.exists:
                return elem.click()