When the balance aggregator doesn't have any balance for an address, it doesn't return anything for that one. In the current implementation, the power balance snapshot for that user will remain empty forever. We must identify when no balance is returned for an address and fill it with zero!
impact-graph fills power snapshot balances by querying the balance aggregator as below
https://github.com/Giveth/impact-graph/blob/bc3b435688c6c1124551c2f68b3802616963346f/src/services/cronJobs/fillSnapshotBalances.ts#L124-L143
When the balance aggregator doesn't have any balance for an address, it doesn't return anything for that one. In the current implementation, the power balance snapshot for that user will remain empty forever. We must identify when no balance is returned for an address and fill it with zero!