Dialog: Don't try to place the dialog next to itself on destroy. Fixe…

…s #8613 - Destroying a dialog removes the original element from the DOM.

ui/jquery.ui.dialog.js

@@ -216,7 +216,8 @@ $.widget("ui.dialog", {
 		}
 
 		next = oldPosition.parent.children().eq( oldPosition.index );
-		if ( next.length ) {
+		// Don't try to place the dialog next to itself (#8613)
+		if ( next.length && next[ 0 ] !== this.element[ 0 ] ) {
 			next.before( this.element );
 		} else {
 			oldPosition.parent.append( this.element );