cli/sync: filter seeds without an address
If a seed for syncing does not have an address, the local node will not be able to connect to it.
These can be filtered out so that no connection attempts are made for these nodes.
If a seed for syncing does not have an address, the local node will not be able to connect to it.
These can be filtered out so that no connection attempts are made for these nodes.
Shorten a bit and rebase.