Bug repro steps unknown, seems to happen when fetching an article (load new article, pull to refresh, etc.).

HockeyApp Report: https://rink.hockeyapp.net/manage/apps/152731/app_versions/5/crash_reasons/32629528

Crash occurs because we are inserting an object at an index above 0 for an empty array. Specifically for sections, we create an empty array, then iteratively insert new section objects for each section. If, for some reason, we skip a missing/invalid section, the app will crash when it attempts to insert the next section. For example:

• Insert section 0
• ... optionally insert more sections
• fail to insert a new section at index N
• attempt to insert section at N + 1 => index N+1 is beyond the bounds of the array because section N wasn't created