Fix request body validation when assignment status is reported

[PetarTodorovv]

Description
In the "status API" when someone reports status for assignment we incorrectly interpret the configuration property when it's set to null. And it seems the config is provided whereas it should be empty/null, resulting in a request body validation error.

Changes proposed in this pull request:

• Check for different "empty" values in the request body's configuration property

Related issue(s)

• ...

Pull Request status

• Implementation
• Unit tests
• Integration tests
• chart/compass/values.yaml is updated
• Mocks are regenerated, using the automated script

[ognyvrac]

/test pre-main-compass-integration-no-dump

[kyma-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ivantenevvasilev

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• OWNERS [ivantenevvasilev]
• components/director/internal/formationmapping/OWNERS [ivantenevvasilev]

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[kyma-bot]

@PetarTodorovv: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pre-main-compass-gke-benchmark	7d52233	link	false	/test pre-main-compass-gke-benchmark

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