What happened?

Description

I have a custom field of type Dropdown that is added as a non-required field to an entry type. The Dropdown has an option that allows for an empty value and a label of "(None)".

After adding this field to an existing entry type, I'd like to use the entries index to quickly find entries that have (a) any non-empty option selected or (b) no option or the empty option selected. Query (a) helps me to see entries that have opted in to this new field without having to manually select all the valid options. Query (b) is the opposite and shows me the entries that still need to opt-in to the new field.

Steps to reproduce

1. Create a custom field of type "Dropdown"
2. Add dropdown options:
   • Label: (None); Value:
   • Label: French; Value: fr
   • Label: Italian; Value: it
3. Add this new field to an entry type as a non-required field
4. Create or edit and existing entry of the same type, ensuring the new field's dropdown had selected the empty "(None)" option
5. From the entry index, open the search filter popover
6. Add a filter for the new field
7. Focus on the text input next to the "is one of" operator dropdown

Expected behavior

The operator dropdown either includes operators to allow me to filter to only the entries that have the "(None)" option selected or the field has yet to be populated (aka empty).

Actual behavior

Only the "is one of" or "is not one of" operators are available and neither of them allow the inclusion of empty value labeled "(None)".

Craft CMS version

4.14.10

PHP version

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Operating system and version

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Database type and version

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Image driver and version

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Installed plugins and versions