hg: jdk8/awt/jdk: 6337518: Null Arrow Button Throws Exception in BasicComboBoxUI

[mikhail.cherkasov at oracle.com]

Changeset: 9a8e0140123a
Author:    alitvinov
Date:      2013-06-03 16:37 +0400
URL:       http://hg.openjdk.java.net/jdk8/awt/jdk/rev/9a8e0140123a

6337518: Null Arrow Button Throws Exception in BasicComboBoxUI
Reviewed-by: alexp, alexsch

! src/share/classes/javax/swing/plaf/basic/BasicComboBoxUI.java
+ test/javax/swing/JComboBox/6337518/bug6337518.java