N/A min block height for empty list of utxos

[JorgeMartinezPizarro]

bge api

https://api.bitcoinprivacy.net/tx_utxos/44c3378d8e2e9092560dd7b990c77d7d90761bace5c21f8b0c3657d697f714ea/summary

atm {"count":0,"sum":0,"minHeight":2147483647,"maxHeight":0}