Fix Root element is missing exception

[jayfunc]

Hi! Thanks for your work, but I came across the error when I used this package in my WinUI 3 project with .NET 8.

I tried to get the auth URL, and it gave me an error: "Root element is missing". After forking it and locating it, the error seems like something is wrong with the Stream.

I added a few lines based on the comment below:
https://stackoverflow.com/questions/10125810/root-element-is-missing

And the error no longer exists. I also tested some other functions like getting user info and posting scrobbling, and they worked well.

I just created this pull request to make this package more stable and with fewer bugs.

Hope this helped!

[wo80]

Hi @jayfunc ,

sorry for the late reply. I finally had some time to take a closer look. The cause of this problem is 7f89630.

Last.fm/src/Hqub.Lastfm/Request.cs

Lines 130 to 140 in 7f89630

	var doc = GetXDocument(stream);
	var responseContainsError = ResponseParser.Default.TryParseResponseError(doc, out string message, out int error);
	if (!response.IsSuccessStatusCode || responseContainsError)
	{
	throw new ServiceException(method, error, response.StatusCode, message ?? response.ReasonPhrase);
	}
	return GetXDocument(stream);
	}

In the Request.PostAsync(...) method, GetXDocument(...) is called twice, while the method should just return doc. Could you delete your latest commit, do the fix and then force push, so this pull request gets updated?

Thanks for bringing this to my attention!

[jayfunc]

Hi, I have done the modification. Thank you for your response!

[wo80]

Thank you! I will do a patch release in the next days.

[wo80]

@jayfunc I have updated the nuget package.

[jayfunc]

@wo80 Thanks!