hg: jigsaw/jigsaw/jdk: 2 new changesets

[Dalibor Topic]

Mandy Chung wrote:
> Hi Dalibor,
> 
> The JpkgArgsTest.java test fails with my jigsaw build.  Should jpkg
> check if it's a valid directory before writing the module file?

Thanks, Mandy. I couldn't reproduce the issue, but I added a few
more checks into the module file writing code to catch issues
tested for in the JpkgArgsTest, along with a fix for dealing
with empty directories in
http://hg.openjdk.java.net/jigsaw/jigsaw/jdk/rev/87ea0cc3df51

cheers,
dalibor topic
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