improved type safety

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@6645 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/model/HealthReport.java

@@ -161,7 +161,7 @@ public class HealthReport implements Serializable, Comparable<HealthReport> {
      * @return Value for property 'aggregatedReports'.
      */
     public List<HealthReport> getAggregatedReports() {
-        return Collections.EMPTY_LIST;
+        return Collections.emptyList();
     }
 
     /**