Oops, should not have added fail here

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1003545 13f79535-47bb-0310-9956-ffa450edef68

src/test/java/org/apache/commons/math/ode/ContinuousOutputModelTest.java

@@ -159,12 +159,10 @@ public class ContinuousOutputModelTest
           ContinuousOutputModel otherCm = new ContinuousOutputModel();
           otherCm.handleStep(buildInterpolator(t0, y0, t1), true);
           cm.append(otherCm);
-          fail("Expecting IllegalArgumentException");
       } catch(IllegalArgumentException iae) {
-          //expected behavior
-          return true;
+          return true; // there was an allowable error
       }
-      return false;
+      return false; // no allowable error
   }
 
   private StepInterpolator buildInterpolator(double t0, double[] y0, double t1) {