fixed SerializationTest.testReferenceTest - completely now.  Not sure
how this worked before (Sebastian?), but order does matter, for this
test.
Enabling null analysis, fixing related errors.
Fix for handling empty resources in editor in new architecture
switched NoNameFeatureMappingException from a unchecked RuntimeException
to a standard checked Exception
Fixes IllegalStateException popping up during "normal" incomplete
Factory edits. ModelBuilder throwing new (checked) ModelBuilderException
instead of unexpected undocumented unchecked IllegalStateException out
of nowhere.