Global .ajaxError() bug with http code 301

[alexpts]

Global event .ajaxError() called when ajax requests complete with http code 301 without error.

[dmethvin]

The docs explain that a 3xx is considered an error; we don't automatically follow redirects in an attempt to make them successful. From the ​jQuery.ajax docs:

If the request is successful, the status code functions take the same parameters as the success callback; if it results in an error (including 3xx redirect), they take the same parameters as the error callback.