Update locators.js
Modify: updated jsdoc for object return
@@ -94,7 +94,7 @@ bot.locators.add = function(name, strategy) {
* Object.prototype, if any exists.
*
* @param {Object} target The object to pick a key from.
- * @return {string?} The key or null if the object is empty.
+ * @return {?string} The key or null if the object is empty.
*/
bot.locators.getOnlyKey = function(target) {
for (var k in target) {
