fix: keep heartbeat running when nginx site listing is unavailable

internal/telemetry/telemetry.go

@@ -76,11 +76,10 @@ func BuildPayload(ctx context.Context, cfg config.Config) (Payload, error) {
 	}
 
 	nginxInstalled, nginxSites, err := detectNginx()
-	if err != nil {
-		return payload, err
+	if err == nil {
+		payload.NginxInstalled = nginxInstalled
+		payload.NginxSites = nginxSites
 	}
-	payload.NginxInstalled = nginxInstalled
-	payload.NginxSites = nginxSites
 
 	return payload, nil
 }