[BUG][jaxrs-spec] disallowAdditionalPropertiesIfNotPresent leads to compilation errors

Bug Report Checklist

• 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?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

Using the generator option:
disallowAdditionalPropertiesIfNotPresent=false
... with the jaxrs-spec generator leads to invalid POJOs being generated.

Seems to be a regression introduced by #22366 (found during openapi-generator-maven-plugin from 7.17 to 7.21).

This part of the change assumes that this.put / this.get methods are present - which is NOT the case when the mentioned generator option is set while "additionalProperties" is not defined on the model - hence the POJO doesn't extend Map<> --> compiler error.

openapi-generator version

7.20, 7.21

OpenAPI declaration file content or url

reproducer repo: https://github.com/Philipp-Borchert-ISH/jaxrs-spec-repro

plain old petstore.yaml https://github.com/Philipp-Borchert-ISH/jaxrs-spec-repro/blob/main/src/main/resources/petstore.yaml

Generation Details

see https://github.com/Philipp-Borchert-ISH/jaxrs-spec-repro/blob/8e8761881dbd8ed264e5839466e6be424c73c6fd/pom.xml#L102-L121

Steps to reproduce

1. run mvn compile or ./mvnw compile
2. observe compilation errors due to missing "extends Map<>" on several POJOs

Suggest a fix

Reproduce the failure with the jaxrs-spec generator using the referenced petstore.yaml and the option disallowAdditionalPropertiesIfNotPresent=false, then run mvn compile in the linked reproducer. Inspect the generated POJOs and the change from #22366; done means models without additionalProperties compile without calling Map methods they do not provide.