hg: openjfx/9-dev/rt: 8156982: NPE in PrismImage.toDataURL when browsing web pages with images

[chien.yang at oracle.com]

Changeset: 7e06a98ddd7a
Author:    Chien Yang <chien.yang at oracle.com>
Date:      2016-05-18 21:32 -0700
URL:       http://hg.openjdk.java.net/openjfx/9-dev/rt/rev/7e06a98ddd7a

8156982: NPE in PrismImage.toDataURL when browsing web pages with images
Reviewed-by: kcr

! modules/graphics/src/main/java/com/sun/javafx/tk/Toolkit.java