hg: openjfx/9-dev/rt: 8163526: protect FileChooser return from internal NPE

[david.hill at oracle.com]

Changeset: 6f8b4d12b00d
Author:    ddhill
Date:      2016-08-10 14:55 -0400
URL:       http://hg.openjdk.java.net/openjfx/9-dev/rt/rev/6f8b4d12b00d

8163526: protect FileChooser return from internal NPE
Reviewed-by: kcr

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