fix: 修复通知公告发送所有人NPE

修复通知公告发送所有人NPE

src/main/java/com/youlai/boot/common/util/CommonUtil.java

@@ -26,6 +26,9 @@ public class CommonUtil {
      * @return 字符串
      */
     public static String listToStr(List<String> list, String separator) {
+        if(list == null || list.isEmpty()){
+            return "";
+        }
         return list.stream().collect(Collectors.joining(separator));
     }
 

src/main/java/com/youlai/boot/system/controller/NoticeController.java

@@ -31,7 +31,6 @@ import org.springframework.web.bind.annotation.*;
 public class NoticeController  {
 
     private final NoticeService noticeService;
-
     private final NoticeStatusService noticeStatusService;
 
     @Operation(summary = "通知公告分页列表")