Filters in dashboards allow an empty value

[paoliniluis]

Describe the bug
When using dropdown filters, if you don't select a value and click on the button, then the filter will populate but with an empty value. No effect at all, but seems like the queries run

Logs
NA

To Reproduce

1. Build a question (people table)
2. add it to a dashboard
3. add a dropdown filter to a dashboard and connect it with source
4. save the dashboard and pop up the filter, don't select any value but click the button
5. see the error

Expected behavior
If there's no value, you can't confirm

Screenshots

Information about your Metabase Installation:

• Your browser and the version: Brave latest
• Your operating system: pop 22.04
• Your databases: postgres
• Metabase version: 1.44.2
• Metabase hosting environment: Docker
• Metabase internal database: Postgres

Severity
P3

Additional context
NA

[flamber]

Related to #15462