[for review] 6948144: jpkg throws NPE if resource directory does not exist

[Alan Bateman]

Dalibor Topic wrote:
> :
> How about calling is JpkgTestInputParameters? Then expanding the
> test to cover more of the cases will feel rather natural.
>   
JpkgArgsTest could work but I don't have a strong preference. Thanks for 
fixing this one (it was actually Akhil that asked me about it, which is 
why I created the bug).

-Alan.