Log a note when catchError sets build result

src/main/java/org/jenkinsci/plugins/workflow/steps/CatchErrorStep.java

@@ -248,6 +248,7 @@ public Object readResolve() {
                         Functions.printStackTrace(t, listener.getLogger());
                     }
                     if (buildResult.isWorseThan(Result.SUCCESS)) {
+                        listener.getLogger().println("Setting overall build result to " + buildResult);
                         context.get(Run.class).setResult(buildResult);
                     }
                     if (stepResult.isWorseThan(Result.SUCCESS)) {

src/test/java/org/jenkinsci/plugins/workflow/steps/CatchErrorStepTest.java

@@ -118,6 +118,7 @@ public class CatchErrorStepTest {
                 "}", true));
         WorkflowRun b = p.scheduleBuild2(0).waitForStart();
         assertCatchError(r, b, Result.UNSTABLE, null, true);
+        r.assertLogContains("Setting overall build result to UNSTABLE", b);
     }
 
     @Test public void invalidBuildResult() throws Exception {