SafetyPatterns: Avoid warning about non-existent EPackage
Avoid the following error:
Error: EPackage for "http://www.fortiss.org/af3/requirements_patterns" has not been registered (in extension point "org.eclipse.emf.ecore.generated_package").
Avoid the following error:
Error: EPackage for "http://www.fortiss.org/af3/requirements_patterns" has not been registered (in extension point "org.eclipse.emf.ecore.generated_package").