prevent error loop in case of undefined `$wrapper.data('multipleInput')`
prevent error loop in case of undefined `$wrapper.data('multipleInput')`

if for any reason this code line fails, the interval is not removed and
console.log fills with error messages every 10ms.

This change prevents that from happening.

I have no idea why it fails, but the widget works fine.

unclead/yii2-multiple-input,unclead/yii2-multiple-input