Check for null index on object subscript (fixes #228)
Check for null index on object subscript (fixes #228)

gitlarryf/neon-lang,gitlarryf/neon-lang,gitlarryf/neon-lang,gitlarryf/neon-lang,gitlarryf/neon-lang,ghewgill/neon-lang,ghewgill/neon-lang,ghewgill/neon-lang,ghewgill/neon-lang,ghewgill/neon-lang,ghewgill/neon-lang,gitlarryf/neon-lang,ghewgill/neon-lang,gitlarryf/neon-lang,ghewgill/neon-lang,gitlarryf/neon-lang,gitlarryf/neon-lang,ghewgill/neon-lang,ghewgill/neon-lang,gitlarryf/neon-lang