Fix columns number not showing properly when importing (due to string vs int type)

Author: rilwis

assets/app/controls/Range.js

@@ -4,6 +4,11 @@ import DivRow from './DivRow';
 const Range = ( { name, defaultValue, updateField, ...rest } ) => {
 	const update = value => updateField( name, value );
 
+	defaultValue = Number( defaultValue );
+	if ( isNaN( defaultValue ) || defaultValue < 1 || defaultValue > 12 ) {
+		defaultValue = 12;
+	}
+
 	return (
 		<DivRow { ...rest }>
 			<RangeControl min={ 1 } max={ 12 } initialPosition={ 12 } value={ defaultValue } onChange={ update } />