Method isEmpty

lib/rules.js:22–34

* helper function - check if provided value is empty * @param value * @returns {Boolean}

(value)

     * @returns {Boolean}
     */
    isEmpty(value) {

        if (typeof value === 'undefined') {
            return true;
        }

        if (value === null) {
            return true;
        }

        return !value.toString().trim();

    }

    /**
     *