Fix annotations message for InfluxDB (#4469)

Author: soulgalore

lib/support/annotationsHelper.js

@@ -28,7 +28,7 @@ export function getAnnotationMessage(
 
   const extraMessage =
     options.graphite.annotationMessage ||
-    options.influxdb.annotationMessage ||
+    (options.influxdb && options.influxdb.annotationMessage) ||
     options.grafana.annotationMessage ||
     undefined;