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

[Dalibor Topic]

Hi Alan,

thanks for reporting a NPE with
$ jpkg -m existing-dir -r non-existing-dir jmod some-mod

the fix is easy - test whether the resource path exists before passing
it on to module file writer ;) The webrev is at
http://cr.openjdk.java.net/~robilad/6948144/webrev.00/

Once this one is in, I'll commit similar tests for the remaining parameters.

cheers,
dalibor topic
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