Fix advanced filter on nullable field

[cregourd]

Title

Fix error when use advanced filters on nullable relationship field

Type of Change

• [ ] New feature
• [x] Bug fix
• [ ] Documentation update
• [ ] Example update
• [ ] Refactoring
• [ ] Hotfix
• [ ] Security patch
• [ ] UI/UX improvement

Issue

481

Description

There was error when using advanced filters on nullable relationship field

Impact

No impact

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 193579a122573664f7c6b239a1ed07e6689c0ea7

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ------------------------ | ----- | | @premieroctet/next-admin | Patch |

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