RFR 8136831 : Undefined null behavior in Class[Loader].getResourceXXXX()

[Brent Christian]

Hi,

Thank you to Paul for pointing out to me that ClassLoader.resources() 
also falls into this category.

I have updated resources() to follow suit, along with test code (and 
Mandy's suggested test changes) in this updated webrev:

http://cr.openjdk.java.net/~bchristi/8136831/webrev.03/

Thanks,
-Brent