[BUG] [Kotlin Spring] Example field is filled when not specified

[wegendt-bosch]

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• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
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Description

If I don't specify an example for a schema, the generator will generate annotation @Schema(example="null", ...). No examples should lead to no example generation.

openapi-generator version

7.23.0

OpenAPI declaration file content or url

Generation Details

Steps to reproduce

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