[BUG] [JAVA] AbstractOpenApiSchema class generated even if generateModels is set to false

[SimoneGiusso]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• 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

I want to skip the generation of the model and for this I set:

<properties>
    <openapi.generator.maven.plugin.generateModels>false</openapi.generator.maven.plugin.generateModels>
</properties>

setting just <generateModels>false</generateModels> doesn't work due to this open issue I guess. Anyway the model is not generated indeed but under generated-docs/orgs/mode/ there is still something inside: the AbstractOpenApiSchema class (which doesn't not compile due to this other issue.

openapi-generator version

6.3.0

Suggest a fix

The desidered behaviour is to have the model directory completely empty (or not generated at all).