fix bug

fm-common/src/main/java/com/persagy/fm/common/utils/ListUtil.java

@@ -58,7 +58,7 @@ public class ListUtil {
 
     public static <T> Boolean listChanged(List<T> listBefore, List<T> listAfter) {
         if (listBefore == null) {
-            return listAfter == null;
+            return listAfter != null;
         }
         if (listAfter == null) {
             return true;