Bug-Fix: FRC Team Rank - Handle null qual data from The Blue Alliance API

[dragid10]

Summary

• The Blue Alliance API returns "qual": null when an event is active but qualification matches haven't started yet
• The existing null checks only verified key existence (not in), not whether the value was None, causing a crash on the in operator
• Added == None checks at each nesting level in get_team_ranking() so the app gracefully falls back to the default ranking message

[tidbyt]

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[dragid10]

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