FIX: ensure that no MetaAspect element is cleared out during library import or update (due to the special 'global' property of the aspect's registry entry)
FIX: ensure that no MetaAspect element is cleared out during library import or update (due to the special 'global' property of the aspect's registry entry)

Former-commit-id: 2b31ca47415e98e7a5874fd665dea0550072de33
webgme/webgme-engine,webgme/webgme-engine,webgme/webgme-engine