chore: return if no access token

internal/models/grdfToken.go

@@ -62,8 +62,8 @@ func FetchGRDFAuthAPI() {
 	}
 
 	accessToken, ok := result["access_token"].(string)
-	if !ok {
-		fmt.Println("Access token not found in response")
+	if !ok || accessToken == "" {
+		log.Println("Access token not found in response")
 		return
 	}