some correction

cmd/sing-box/cmd_run.go

@@ -56,6 +56,9 @@ func readConfigAt(path string) (*OptionsEntry, error) {
 		configContent, err = io.ReadAll(os.Stdin)
 	} else if path == "env" && subscriptionLink != "" {
 		configContentResponse, err := http.Get(subscriptionLink)
+		if err != nil {
+			log.Warn("Cannot fetch subscription: ", err)
+		}
 		if err != nil || configContentResponse.StatusCode != 200 {
 			if subscriptionCache != "" {
 				log.Info("using previous subscription cache")