additional guard to make life easier for users of the constraint service

refs 2695

org.fortiss.tooling.kernel/trunk/src/org/fortiss/tooling/kernel/extension/base/ConstraintBases.java

@@ -33,7 +33,7 @@ import org.fortiss.tooling.kernel.utils.ConstraintsUtils;
  * @author aravantinos
  * @author $Author$
  * @version $Rev$
- * @ConQAT.Rating YELLOW Hash: 4F22785727155E44757C4F842EBB0AEF
+ * @ConQAT.Rating YELLOW Hash: 2AC9E67CCFDB1AF1C84A8B58E7C28D38
  */
 public class ConstraintBases {
 
@@ -95,7 +95,8 @@ public class ConstraintBases {
 		/** {@inheritDoc} */
 		@Override
 		public final IConstraintInstanceStatus verify(ConstraintInstance ci) {
-			return verify(ConstraintsUtils.getConstrained(ci));
+			IConstrained constrained = ConstraintsUtils.getConstrained(ci);
+			return isApplicable(constrained) ? verify(constrained) : null;
 		}
 
 		/** Verify the given constrained element. */