[OpenJDK 2D-Dev] RFR: 8061392: PrinterJob NPE when drawing translucent image with null user clip

[Phil Race]

http://cr.openjdk.java.net/~prr/8061392/
https://bugs.openjdk.java.net/browse/JDK-8061392

A  check for null was missing
This was partly to blame for a JavaFX printing bug.

-phil.