api: fix 404->500 and NPE issues

api/v1/models.go

@@ -193,12 +193,14 @@ type Notification struct {
 func NotificationFromDatabaseModel(dbNotification database.VulnerabilityNotification, limit int, page, nextPage database.VulnerabilityNotificationPageNumber) Notification {
 	var oldVuln *VulnerabilityWithLayers
 	if dbNotification.OldVulnerability != nil {
-		*oldVuln = VulnerabilityWithLayersFromDatabaseModel(*dbNotification.OldVulnerability)
+		v := VulnerabilityWithLayersFromDatabaseModel(*dbNotification.OldVulnerability)
+		oldVuln = &v
 	}
 
 	var newVuln *VulnerabilityWithLayers
 	if dbNotification.NewVulnerability != nil {
-		*newVuln = VulnerabilityWithLayersFromDatabaseModel(*dbNotification.NewVulnerability)
+		v := VulnerabilityWithLayersFromDatabaseModel(*dbNotification.NewVulnerability)
+		newVuln = &v
 	}
 
 	var nextPageStr string

api/v1/routes.go

@@ -326,7 +326,10 @@ func getNotification(w http.ResponseWriter, r *http.Request, p httprouter.Params
 	}
 
 	dbNotification, nextPage, err := ctx.Store.GetNotification(p.ByName("notificationName"), limit, page)
-	if err != nil {
+	if err == cerrors.ErrNotFound {
+		writeResponse(w, http.StatusNotFound, NotificationEnvelope{Error: &Error{err.Error()}})
+		return deleteNotificationRoute, http.StatusNotFound
+	} else if err != nil {
 		writeResponse(w, http.StatusInternalServerError, NotificationEnvelope{Error: &Error{err.Error()}})
 		return getNotificationRoute, http.StatusInternalServerError
 	}