hg: openjfx/8u-dev/rt: RT-38664: SwingNode: IllegalArgumentException about "null source" when closing combobox

[anthony.petrov at oracle.com]

Changeset: 76ebb8a404ab
Author:    Anthony Petrov <anthony.petrov at oracle.com>
Date:      2014-09-17 10:17 +0400
URL:       http://hg.openjdk.java.net/openjfx/8u-dev/rt/rev/76ebb8a404ab

RT-38664: SwingNode: IllegalArgumentException about "null source" when closing combobox
Summary: Add a null check
Reviewed-by: kcr

! modules/swing/src/main/java/javafx/embed/swing/SwingNode.java