REQ-2595-待办数量查询，对应分类枚举为空，补充为空值

inside-notices/src/main/java/cn/axzo/msg/center/message/service/todo/TodoSimpleQueryService.java

@@ -190,6 +190,9 @@ public class TodoSimpleQueryService {
                         .build());
             }
         }
+        for (BizCategoryEnum bc : BizCategoryEnum.values()) {
+            resultMap.computeIfAbsent(bc, k -> new PendingMessageCountDTO());
+        }
         return resultMap;
     }