Responses with type void caused exception

[programatix]

Describe the bug
Using type void in responses crashed node,js.

To Reproduce
Steps to reproduce the behavior:

1. Follow the instructions found at https://ts-spec.github.io/tspec/guide/crud-api-example.
2. For path delete, the responses for 204 is void. It crashed node.js

Expected behavior
No crash.

Exception

...\node_modules\typescript-json-schema\dist\typescript-json-schema.js:470
                    throw new Error("Not supported: root type undefined");
                          ^

Error: Not supported: root type undefined
    at JsonSchemaGenerator.getDefinitionForRootType (...\node_modules\typescript-json-schema\dist\typescript-json-schema.js:470:27)
    at JsonSchemaGenerator.getTypeDefinition (...\node_modules\typescript-json-schema\dist\typescript-json-schema.js:1120:26)
    at JsonSchemaGenerator.getDefinitionForProperty (...\node_modules\typescript-json-schema\dist\typescript-json-schema.js:591:31)
    at ...\node_modules\typescript-json-schema\dist\typescript-json-schema.js:905:37
    at Array.reduce (<anonymous>)
    at JsonSchemaGenerator.getClassDefinition (...\node_modules\typescript-json-schema\dist\typescript-json-schema.js:903:45)
    at JsonSchemaGenerator.getTypeDefinition (...\node_modules\typescript-json-schema\dist\typescript-json-schema.js:1134:26)
    at JsonSchemaGenerator.getDefinitionForProperty (...\node_modules\typescript-json-schema\dist\typescript-json-schema.js:591:31)
    at ...\node_modules\typescript-json-schema\dist\typescript-json-schema.js:905:37
    at Array.reduce (<anonymous>)

Node.js v22.2.0

Desktop (please complete the following information):

• OS: Windows
• Browser: Chrome

Versions
"tspec": "^0.1.114"
"typescript": "^5.4.5"