Fix rare segfault situations where there is a NULL in the iGlobals array, instead of a PMCNULL
Fix rare segfault situations where there is a NULL in the iGlobals array, instead of a PMCNULL

tkob/parrot,gagern/parrot,parrot/parrot,gagern/parrot,tkob/parrot,youprofit/parrot,gagern/parrot,FROGGS/parrot,tkob/parrot,gitster/parrot,tkob/parrot,youprofit/parrot,parrot/parrot,FROGGS/parrot,parrot/parrot,gitster/parrot,youprofit/parrot,gitster/parrot,FROGGS/parrot,gitster/parrot,tkob/parrot,tkob/parrot,youprofit/parrot,FROGGS/parrot,FROGGS/parrot,youprofit/parrot,youprofit/parrot,FROGGS/parrot,gagern/parrot,gagern/parrot,gitster/parrot,gagern/parrot,FROGGS/parrot,parrot/parrot,gagern/parrot,parrot/parrot,FROGGS/parrot,youprofit/parrot,youprofit/parrot,gitster/parrot,gitster/parrot,tkob/parrot,tkob/parrot