The `DBBACKUP_DATABASES` configuration is ignored

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Bug Report

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Describe the bug

The DBBACKUP_DATABASES configuration is ignored. This is due to a bug in this line of code: https://github.com/jazzband/django-dbbackup/blob/790ec8bd297ef24cddfd2618d18d243abd15437e/dbbackup/management/commands/dbbackup.py#L83

If a -d option is not given, this code will always evaluate to [''], with the result that default is the database chosen.

To Reproduce

• Configure DBBACKUP_DATABASES to use a non default database`
• python manage.py dbbackup
• Note that the database that is backed up is defaul, not the database specified by DBBACKUP_DATABASES

Expected behavior

The dbbackup command should backup the databases configure in DBBACKUP_DATABASES

Screenshots or reproduction

If applicable, add screenshots (errors, example of the behavior, etc.) to help explain your problem or post a link to a repository that replicates the issue.

Versions

Django-dbbackup

• pypi: 4.0.2

External tools

• Python: 3.11.6
• Django: 4.1.13
• OS: MacOS