useHttpClientCreationMethod option not shown in NSwagStudio when not using a base class

[rhegner]

Describe the bug

NSwagStudio shows the useHttpClientCreationMethod option only if a base class is specified.

However, the option also makes perfect sense without a base class, if CreateHttpClientAsync is implemented in a partial class.

Version of NSwag toolchain, computer and .NET runtime used

NSwagStudio 14.3.0.0

To Reproduce

Try enabling the useHttpClientCreationMethod option without setting a base class.

Expected behavior

It should be possible to set the option also without configuring a base class. In my case, I'm implementing the CreateHttpClientAsync method in a partial class.