migrateStoreV121: Only attempt to transfer Coins if at least one Coin to transfer
Open in response to this feedback.
A further thought: On reflection, since not including hard-coding for specific networks, perhaps migrateStoreV121
could have directly gone into manager_store_common.go
rather than being duplicated across _mainnet/_regtest/_stagenet.
Please indicate if I should consolidate these into _common in this same MR.