fix info_splunk_index null value issue (#220)

Author: luckyj5

.circleci/config.yml

@@ -82,7 +82,6 @@ workflows:
           filters:
             branches:
               only:
-                - INGEST-15507-nozzle-v2-update
                 - develop
                 - master
       - tile-builder:

events/events.go

@@ -165,7 +165,10 @@ func (e *Event) AnnotateWithAppData(appCache cache.Cache) {
 			e.Fields["cf_org_name"] = cf_org_name
 		}
 
-		e.Fields["info_splunk_index"] = app_env["SPLUNK_INDEX"]
+		if app_env["SPLUNK_INDEX"] != nil {
+			e.Fields["info_splunk_index"] = app_env["SPLUNK_INDEX"]
+		}
+
 		e.Fields["cf_ignored_app"] = cf_ignored_app
 	}
 }