public IList<ExternalResourceReference> GetExternalResourceReferencesFromFailedLoads()
In cases, where a nested structure of several links were loaded, this method is intended to be a convenient way for IExternalResourceUIServers to determine whether a top-level link, or any sub-link, which failed to load properly was provided by their IExternalResourceServer or another server.
If this link and all nested links loaded successfully, then an empty list is returned.