[perl #123684] Empty code block crashes on JVM

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# New Ticket Created by  Elizabeth Mattijsen 
# Please include the string:  [perl #123684]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=123684 >


$ perl6-j -e '{;}'
Exception in thread "main" org.perl6.nqp.runtime.UnwindException
        at org.perl6.nqp.runtime.ThreadContext.<init>(ThreadContext.java:120)
        at 
org.perl6.nqp.runtime.GlobalContext.getCurrentThreadContext(GlobalContext.java:333)
        at org.perl6.nqp.runtime.GlobalContext.<init>(GlobalContext.java:248)
        at 
org.perl6.nqp.runtime.CompilationUnit.enterFromMain(CompilationUnit.java:56)
        at perl6.main(gen/jvm/main.nqp)