message: Do not error if update is not found for target
  This fixes this installer bug when using `install.sh` from a target that does not have any releases published on stable
  <img width="715" alt="image" src="https://user-images.githubusercontent.com/4210949/127544099-49064f3e-a5db-4263-91fa-758e3f3b5187.png">
diff: @@ -59,11 +59,10 @@ impl InstallOpt {
  // After any "install" command, check if the CLI has an available update,
  // i.e. one that is not required, but present.
  - let maybe_latest = check_update_available(&agent, false).await?;
  - if let Some(latest_version) = maybe_latest {
  + let update_result = check_update_available(&agent, false).await;
  + if let Ok(Some(latest_version)) = update_result {
  prompt_available_update(&latest_version);
  }
  -
  Ok(())
  }
  