87e19b047c
7ecc29a0b7a23d8f5d3c1e6a0dad29b3ad839eb9 test: wallet, add coverage for addressbook migration (furszy)
a277f8357ad8b0eb26f33fc36f919d868c06847b wallet: migration bugfix, persist empty labels (furszy)
1b64f6498c394a143df196172a14204fe3b8a744 wallet: migration bugfix, clone 'send' record label to all wallets (furszy)
Pull request description:
Addressing two specific bugs encountered during the wallet migration process, related to the address book, and improves the test coverage for it.
Bug 1: Non-Cloning of External 'Send' Records
The external 'send' records were not being correctly cloned to all wallets.
Bug 2: Persistence of Empty Labels
As address book entries without associated db label records can be treated as change (the `label` field inside the `CAddressBookData` class is optional, `nullopt` labels make `CAddressBookData ::IsChange()` return true), we must persist empty labels during the migration process.
The user might have called `setlabel` with an "" string for an external address and that must be retained during migration.
ACKs for top commit:
achow101:
ACK 7ecc29a0b7a23d8f5d3c1e6a0dad29b3ad839eb9
Tree-SHA512: b8a8483a4178a37c49af11eb7ba8a82ca95e54a6cd799e155e33f9fbe7f37b259e28372c77d6944d46b6765f9eaca6b8ca8d1cdd9d223120a3653e4e41d0b6b7
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