hg: openjfx/10-dev/rt: 8189641: [Accessibility, windows] NPE when navigating to ComboBox with empty string

[kevin.rushforth at oracle.com]

Changeset: c33a9143717d
Author:    pkbalakr
Date:      2017-10-19 08:33 -0700
URL:       http://hg.openjdk.java.net/openjfx/10-dev/rt/rev/c33a9143717d

8189641: [Accessibility, windows] NPE when navigating to ComboBox with empty string
Reviewed-by: kcr

! modules/javafx.graphics/src/main/java/com/sun/glass/ui/win/WinAccessible.java