Enabled null pointer checks and modified Amalthea model package
diff --git a/plugins/org.eclipse.app4mc.amalthea.model/META-INF/MANIFEST.MF b/plugins/org.eclipse.app4mc.amalthea.model/META-INF/MANIFEST.MF
index 8930705..a9fba51 100644
--- a/plugins/org.eclipse.app4mc.amalthea.model/META-INF/MANIFEST.MF
+++ b/plugins/org.eclipse.app4mc.amalthea.model/META-INF/MANIFEST.MF
@@ -21,6 +21,7 @@
  org.eclipse.emf.ecore.xcore.lib;visibility:=reexport,
  org.eclipse.xtext.xbase.lib;visibility:=reexport,
  org.eclipse.sphinx.emf;visibility:=reexport,
- org.eclipse.app4mc.amalthea.sphinx;visibility:=reexport
+ org.eclipse.app4mc.amalthea.sphinx;visibility:=reexport,
+ org.eclipse.jdt.annotation;resolution:=optional
 Bundle-ActivationPolicy: lazy
 Automatic-Module-Name: org.eclipse.app4mc.amalthea.model