fix: metadata field required

[lukaisailovic]

Description

• Metadata validation was introduced, however in the same PR it was made required. Reverting the change and making it optional again.
• Test to cover the state when the object is not provided

Type of change

• Chore (non-breaking change that addresses non-functional tasks, maintenance, or code quality improvements)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Draft PR (breaking/non-breaking change which needs more work for having a proper functionality [Mark this PR as ready to review only when completely ready])
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

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Checklist

• I have performed a self-review of my own code
• My changes generate no new warnings
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