/// <summary>
/// Returns the user's avatar URL if they have one.
/// </summary>
/// <returns>
/// The URL, or <code>null</code> if the user is not authenticated or does not have
/// an avatar.
/// </returns>
public string GetUserImageUrl()
{
if (!IsAuthenticated())
{
Logger.e("GetUserImageUrl can only be called after authentication.");
return(null);
}
return(mClient.GetUserImageUrl());
}