exception_error: support objects in ext_info

js/functions.js

@@ -47,6 +47,8 @@ function exception_error(location, e, ext_info) {
 		if (ext_info) {
 			if (ext_info.responseText) {
 				ext_info = ext_info.responseText;
+			} else {
+				ext_info = JSON.stringify(ext_info);
 			}
 		}