feat: update `getBlockReceipts` to return `null` when block is not found#3833

arianejasuwienas merged 5 commits intohiero-ledger:mainhiero-ledger/hiero-json-rpc-relay:mainfrom

mwb-al:3813_getBlockReceipts-return-error-instead-of-nullmwb-al/hiero-json-rpc-relay:3813_getBlockReceipts-return-error-instead-of-nullCopy head branch name to clipboard