Fixed the issue of displaying 0 when the number is null
diff --git a/grafana_plugin/apache-iotdb-datasource.zip b/grafana_plugin/apache-iotdb-datasource.zip
index 0566079..ba61e94 100644
--- a/grafana_plugin/apache-iotdb-datasource.zip
+++ b/grafana_plugin/apache-iotdb-datasource.zip
Binary files differ