Dialog: Check for empty array in addition to empty object when checki…

…ng if there are buttons. Fixes #9043 - Dialog: Buttonpane shown with no buttons when modifying native prototypes.

demos/dialog/default.html

@@ -16,6 +16,7 @@
 	<link rel="stylesheet" href="../demos.css">
 	<script>
 	$(function() {
+		Array.prototype.test = $.noop;
 		$( "#dialog" ).dialog();
 	});
 	</script>

tests/unit/dialog/dialog_options.js

@@ -174,6 +174,16 @@ test("buttons - advanced", function() {
 	element.remove();
 });
 
+test("#9043: buttons with Array.prototype modification", function() {
+	expect( 1 );
+	Array.prototype.test = $.noop;
+	var element = $( "<div></div>" ).dialog();
+	equal( element.dialog( "widget" ).find( ".ui-dialog-buttonpane" ).length, 0,
+		"no button pane" );
+	element.remove();
+	delete Array.prototype.test;
+});
+
 test("closeOnEscape", function() {
 	expect( 6 );
 	var element = $("<div></div>").dialog({ closeOnEscape: false });

ui/jquery.ui.dialog.js

@@ -396,7 +396,7 @@ $.widget( "ui.dialog", {
 		this.uiDialogButtonPane.remove();
 		this.uiButtonSet.empty();
 
-		if ( $.isEmptyObject( buttons ) ) {
+		if ( $.isEmptyObject( buttons ) || ($.isArray( buttons ) && !buttons.length) ) {
 			this.uiDialog.removeClass("ui-dialog-buttons");
 			return;
 		}