fix

haoban-manage3-web/src/main/java/com/gic/haoban/manage/web/controller/MaterialController.java

@@ -94,7 +94,7 @@ public class MaterialController extends WebBaseController{
 			return resultResponse(HaoBanErrCode.ERR_10016);
 		}
 		List<MaterialDTO> list = materialApiService.listMaterialByCategoryId(categoryId);
-		if(!list.isEmpty()){
+		if(list!= null && !list.isEmpty()){
 			return resultResponse(HaoBanErrCode.ERR_10017);
 		}
 		dto.setStatusFlag(0);