hg: jdk/client: 6709913: BasicComboBoxUI.isPopupVisible returns NullPointerException

[prasanta.sadhukhan at oracle.com]

Changeset: 964a2a2c403b
Author:    psadhukhan
Date:      2020-08-05 17:49 +0530
URL:       https://hg.openjdk.java.net/jdk/client/rev/964a2a2c403b

6709913: BasicComboBoxUI.isPopupVisible returns NullPointerException
Reviewed-by: serb

! src/java.desktop/share/classes/javax/swing/plaf/basic/BasicComboBoxUI.java
+ test/jdk/javax/swing/plaf/basic/BasicComboBoxUI/BasicComboNPE.java