Update q.js

nfbind/denodeify: Throw error when wrapping an undefined function. Leads to clearer error message/stack (instead of throwing error when using the resulting promised wrapped function.

q.js

@@ -1918,6 +1918,9 @@ Promise.prototype.nfcall = function (/*...args*/) {
  */
 Q.nfbind =
 Q.denodeify = function (callback /*...args*/) {
+    if (callback === undefined) {
+        throw new Error('Q Cannot wrap an undefined function');
+    }
     var baseArgs = array_slice(arguments, 1);
     return function () {
         var nodeArgs = baseArgs.concat(array_slice(arguments));