blt setup fails with strategy "sync"

[danepowell]

Running blt setup with the setup strategy set to sync can result in this error:

Fatal error: Uncaught TypeError: Argument 1 passed to Drush\Commands\sql\SqlSyncCommands::databaseName() must be an instance of Drush\SiteAlias\AliasRecord, boolean given, called in /mnt/tmp/local.prod/source/vendor/drush/drush/src/Commands/sql/SqlSyncCommands.php on line 142 and defined in /mnt/tmp/local.prod/source/vendor/drush/drush/src/Commands/sql/SqlSyncCommands.php:180

[danepowell]

This occurs when an invalid alias is used: drush-ops/drush#3103

I think this is just a problem with the particular application.

[danepowell]

The underlying cause here was that this particular project hadn't converted to the new Drush 9-style alias files. I documented this update process here: https://github.com/acquia/blt/wiki/Drush-9#aliases