Ajax: do not quote "throws" option - use dot notation instead

Fixes jquerygh-2571
Closes jquerygh-2542

Author: markelog

src/ajax.js

@@ -264,7 +264,7 @@ function ajaxConvert( s, response, jqXHR, isSuccess ) {
 				if ( conv !== true ) {
 
 					// Unless errors are allowed to bubble, catch and return them
-					if ( conv && s[ "throws" ] ) { // jscs:ignore requireDotNotation
+					if ( conv && s.throws ) {
 						response = conv( response );
 					} else {
 						try {