set an error handler for jquery datatables ajax call

New error event handling has been added in Datatables v1.10.5 (released 10th February 2015).

$.fn.dataTable.ext.errMode = function ( settings, helpPage, message ) { 
    console.log(message);
};

See docs here:
https://datatables.net/reference/event/error
https://cdn.datatables.net/1.10.5/