fix(ttd): Gracefully handle missing `parentSpanId` when measuring TTID/TTFD on iOS#4881

krystofwoldrich merged 2 commits intomaingetsentry/sentry-react-native:mainfrom

kw-fix-ttd-ios-crashgetsentry/sentry-react-native:kw-fix-ttd-ios-crashCopy head branch name to clipboard