iOS: SYSTEM group delivered as survey if it's the first group in the experiment definition

[theonezozo]

We had an iOS experiment where the SYSTEM group was group 0 and the survey was group 1. Respondents never saw the survey, but when they tried to self-report, they got questions from the SYSTEM group's fields ("schedule", "make", etc.). Naturally, they didn't receive scheduled pings either, since the SYSTEM group doesn't have a schedule.

Expected behavior: iOS would check to see if groups[0] is a SYSTEM group and skip over to groups[1] if so.