Error Message on missing OCD is a bit misleading

[juergen-albert]

If I use and Configuration Annotation and @Designate without an @ObjectClassDefintion the following Error is shown in bndtools on the bnd file:

DS Component my.fancy.ConfigAnnotation specifies ocd class de.jena.mdo.data.importer.DataImporterConfig which cannot be found; known classes []

I would add a text like: Is there an ObjectClassDefintion Annotation missing onmy.fancy.ConfigAnnotation?

We may also look into placing the error on the @Designate that is causing it.