"Error: Group is invalid" if there are non-existing directories

[Weijun Wang]

I've just updated my local jtreg to 4.1 b12 and noticed a difference.

When working on a bug I had the habit to create a new repo for it and 
remove unrelated tests, so when I call "make jdk_security4" it will run 
much faster. This worked fine but with b12 if a directory is missing I 
will see an error

   .../jdk/test/TEST.groups: group jdk_security4: file not found: 
com/sun/security/jgss
   Error: Group is invalid: jdk_security4

Is this necessary?

On the other hand, even if jdk_security includes jdk_security4, running 
make on it does not fail immediately.

Thanks
Max