[OpenJDK 2D-Dev] RFR: 8059219 : JDK, JDK-8059219, , javax.print.PrintServiceLookup allows to register null service

[Phil Race]

http://cr.openjdk.java.net/~prr/8059219/
https://bugs.openjdk.java.net/browse/JDK-8059219

Straightforward fix for a very old bug ..

-phil.