Fix an issue that alertController:didTapAction:withEvent: delegate method is not called if the action doesn't have completion handler.
Fix an issue that alertController:didTapAction:withEvent: delegate method is not called if the action doesn't have completion handler.

PiperOrigin-RevId: 334301214

material-components/material-components-ios,material-components/material-components-ios,material-components/material-components-ios,material-components/material-components-ios,material-components/material-components-ios