/**
* Copy properties only if not exists in destination.
* @function lib.object.fallbackCopy
* @param {object} src - Source object.
* @param {object} dest - Destination object.
* @returns {object} - Destination object.
*/
module.exports = function (src, dest) {
Object.keys(src).forEach(function (key) {
var has = dest.hasOwnProperty(key);
if (!has) dest[key] = src[key];
});
return dest;
};