Better null check for response when using useOneOfInterfaces
cherry-pick from https://github.com/OpenAPITools/openapi-generator/pull/6253/files#diff-3a138675e8cb40943bcb00feb46edd6f6ee5c5306c29cc19f02c845a299c8658R780
Credit @tuxBurner
cc @OpenAPITools/generator-core-team
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