feat: does not display "No supported" message if there is no body

[kohkimakimoto]

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This PR prevents the “No supported response body returned” message from being displayed when the response body is empty.

In the current implementation, Elements displays the “No supported response body returned” message in the "TryIt" response area when it receives an empty response body from the API server. This message can be misleading because some API servers may intentionally return an empty response body during normal operations.

For example, the "Star a gist" endpoint in the GitHub API:

https://docs.github.com/en/rest/gists/gists?apiVersion=2022-11-28#star-a-gist

Current implementation

Fixed implementation

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