RFR: NPE for some illegal input

[Robert Field]

Switching to an API based implementation was a major overhaul and 
getting the API some exposure was a priority so the implementation has 
some new bugs.

Thanks for the fix, I've pushed to Kulla.

-Robert

On 12/10/14 08:04, bitter_fox wrote:
> Hi, Robert.
>
>  From new commit, some illegal input make NPE:
> -> )
> ...
> Exception in thread "main" java.lang.NullPointerException
>      at tool.Repl.printDiagnostics(Repl.java:282)
>      at tool.Repl.processSource(Repl.java:361)
>      at tool.Repl.run(Repl.java:166)
>      at tool.Repl.start(Repl.java:142)
>      at tool.Repl.main(Repl.java:128)
>
> or ->, [], ::, etc...
>
> Please review my patch:
> webrev: http://cr.openjdk.java.net/~shinyafox/kulla/1/webrev.00/
>
> Regards,
> shinyafox
> ShinyaYoshida(@bitter_fox)