XHR request sometimes throw an error when it is aborted in IE8

[mefcorvi]

In some cases "abort" method in IE8 (8.0.6001.18702IC) invokes onreadystatechange with readyState = 4.

I've fixed it in my code. I replaced

try {
  var oldAbort = xhr.abort;
  xhr.abort = function() {
    if ( xhr ) {
      oldAbort.call( xhr );
    }
    
    onreadystatechange( "abort" );
  };
} catch(e) { }

to

try {
  var oldAbort = xhr.abort;
  xhr.abort = function() {
    if ( xhr ) {
      xhr.onreadystatechange = jQuery.noop;
      oldAbort.call( xhr );
    }
    
    onreadystatechange( "abort" );
  };
} catch(e) { }

[addyosmani]

Duplicate of #6256.