RDomStructuredDocumentationFactory.CreateItem: ignore the symbol if it's null (fixes NullReferenceException).
CreateFromWorker.LoadStemMembers: ignore non stem members (fixes InvalidOperationException).
Added a test that fails prior to the changes, and passes after (Can_get_root_from_string_with_invalid_code2).
Also removed Assert.Inconclusive from Can_get_root_from_string_with_invalid_code since it now passes.
Fixes #101
RDomStructuredDocumentationFactory.CreateItem: ignore the symbol if it's null (fixes NullReferenceException).CreateFromWorker.LoadStemMembers: ignore non stem members (fixes InvalidOperationException).Added a test that fails prior to the changes, and passes after (
Can_get_root_from_string_with_invalid_code2). Also removedAssert.InconclusivefromCan_get_root_from_string_with_invalid_codesince it now passes.