fix: [DEFECT-1331] 允许数据看板的layout为null

@@ -23,7 +23,7 @@ public class TkDataBoardEntity extends TenantBaseEntity {
   @TableField(typeHandler = EnumTypeHandler.class)
   private ViewType viewType;
 
-  @TableField(typeHandler = JacksonTypeHandler.class)
+  @TableField(updateStrategy = FieldStrategy.IGNORED,typeHandler = JacksonTypeHandler.class)
   private JsonNode layout;
 
   private String remark;