Rest API documentation example is missing when the request contains an @OptionalBody

Some REST requests, such as pull request merge, allow a body to be set but do not require it.
These requests are missing example request documentation in the REST API documentation.

For example: https://docs.atlassian.com/bitbucket-server/rest/6.3.2/bitbucket-rest.html#idp265

These requests have example representation javadoc in the code:

     * @request.representation.mediaType application/json
     * @request.representation.example {@link RestPullRequestReopenRequest#REOPEN_REQUEST_EXAMPLE}

And if the @OptionalBody tag is removed from the request, then the example appears in the html.