修复 MagicEntity.getId()" because "entity" is null 异常

magic-api/src/main/java/org/ssssssss/magicapi/core/web/MagicResourceController.java

@@ -83,6 +83,9 @@ public class MagicResourceController extends MagicController implements MagicExc
 				.read(bytes);
 		isTrue(allowVisit(request, Authorization.SAVE, entity), PERMISSION_INVALID);
 		// 自动保存的代码，和旧版代码对比，如果一致，则不保存，直接返回。
+		if (entity!= null){
+			return new JsonBean<>(null);
+		}
 		if(entity.getId() != null && "1".equals(auto)){
 			MagicEntity oldInfo = service.file(entity.getId());
 			if(oldInfo != null && Objects.equals(oldInfo, entity)){