http://cr.openjdk.java.net/~prr/fxprinting/RT-33113/
https://javafx-jira.kenai.com/browse/RT-33113 The problem is that printing doesn't have a screen so we get a NPE. We likely should make printing report a dummy screen so that callers don't need to be aware of this, but at this stage in the game the safer thing is for is to check for null and interpret that as the printing case. -phil.
