underlying value is getting null for index

[hajareshyam]

Describe the bug Hi, thanks for the sharing this amazing library. I have observed that it not retuning the underlying_value for index.

Paste the code { "trading_symbol": "NIFTY", "exchange": "NFO", "segment": "NFO-OPT", "underlying_value": null, "expiry": { "30-05-2024": [] }, "source": "kite_api", "lot_size": 25 }

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