Add an error message if the filter rule is empty.

Set the streaming status to active only once.

src/screen.go

@@ -245,6 +245,8 @@ func getErrMsg(errCode int) (errMsg string) {
 		errMsg = fmt.Sprintf("Invalid formatting of the time")
 	case 1013:
 		errMsg = fmt.Sprintf("Invalid settings file (settings.json), file must be at least version %s", System.Compatibility)
+	case 1014:
+		errMsg = fmt.Sprintf("Invalid filter rule")
 
 	case 1020:
 		errMsg = fmt.Sprintf("Data could not be saved, invalid keyword")