Make configuration truthful and clean remote session files

internal/config/load.go

@@ -378,6 +378,16 @@ func applyPipelineDefaults(cfg *PipelineConfig) {
 	applyRenderDefaults(&cfg.Render)
 	applyScriptoriumDefaults(cfg.Scriptorium)
 	applyNotariusDefaults(cfg.Notarius)
+	applyNotificationDefaults(&cfg.Notification)
+}
+
+func applyNotificationDefaults(cfg *NotificationConfig) {
+	if cfg == nil {
+		return
+	}
+	if strings.TrimSpace(cfg.Mode) == "" {
+		cfg.Mode = DefaultNotificationMode
+	}
 }
 
 func applyCampaignsDefaults(cfg *CampaignsConfig) {