修复API乐谱接口

cooleshow-user/user-admin/src/main/java/com/yonge/cooleshow/admin/controller/MusicSheetController.java

@@ -133,12 +133,17 @@ public class MusicSheetController extends BaseController {
             } else {
                 pageSize = musicSheetDto.getPageSize();
             }
-
+            String search;
+            if(musicSheetDto.getSearch()==null){
+                search = "";
+            } else {
+                search = musicSheetDto.getSearch();
+            }
             LambdaQueryWrapper<MusicSheet> lambdaQueryWrapper = Wrappers.lambdaQuery();
-            lambdaQueryWrapper.or().like(MusicSheet::getMusicSheetName , musicSheetDto.getSearch());
-            lambdaQueryWrapper.or().like(MusicSheet::getComposer , musicSheetDto.getSearch());
-            lambdaQueryWrapper.or().like(MusicSheet::getMusicTag , musicSheetDto.getSearch());
-            lambdaQueryWrapper.or().like(MusicSheet::getMusicSubject , musicSheetDto.getSearch());
+            lambdaQueryWrapper.or().like(MusicSheet::getMusicSheetName , search);
+            lambdaQueryWrapper.or().like(MusicSheet::getComposer , search);
+            lambdaQueryWrapper.or().like(MusicSheet::getMusicTag , search);
+            lambdaQueryWrapper.or().like(MusicSheet::getMusicSubject , search);
 
             Page<MusicSheet> page = new Page<>(pageNo,pageSize);
             return succeed(musicSheetService.page(page, lambdaQueryWrapper));