Add missing addresses field

[natsoni]

Fixes mempool/mempool#5079 by adding a missing addresses field to FutureBit Apollo Solo pool.

[nymkappa]

I'd like the mempool backend to handle this properly regardless, for example:

• Tags ok but missing addresses: set addresses to [] by default, log a WARN
• Addresses ok but missing tags: set tags to [] by default, log a WARN
• Both missing, print an ERR

Something like that..

[natsoni]

I'd like the mempool backend to handle this properly regardless, for example:

• Tags ok but missing addresses: set addresses to [] by default, log a WARN
• Addresses ok but missing tags: set tags to [] by default, log a WARN
• Both missing, print an ERR

Something like that..

Done in mempool/mempool#5098

[nymkappa]

utACK