Fix lookup of non-existent keys/indexes in hashes/arrays so it doesn't give back null.
Fix lookup of non-existent keys/indexes in hashes/arrays so it doesn't give back null.

cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp