Fixed NoNameFeatureMappingException which suddenly started appearing; I
had erroneously rethrown it, when it should actually just be logged (as
a WARN instead of error is probably clear enough)
Fixed error messages in editor which would never disappear - because I
had implemented IDerivedStateComputer discardDerivedState() incompletely
Enabling stricter null analysis
super minor code comment change only
Removing a failing minor and now useless Test
TDD: Failing test illustrating the problem with the ReferenceBuilder as
originally implemented by Sebastian Benz.. the referenced NewObject
'dangles' - as it's not in any Resource.