message: fix sealed-secrets check on kubeapps up
  kubeapps was not checking for the case where the sealed-secrets
  deployment didn't exist, and was incorectly reporting that it did and
  wasn't installed by kubeapps
diff: @@ -316,6 +316,9 @@ func ssecretsExists(c kubecfg.UpdateCmd) (bool, error) {
  return false, err
  }
  ssc, err := rc.Get("sealed-secrets-controller", metav1.GetOptions{})
  + if err != nil {
  + return false, err
  + }
  return ssc.GetLabels()["created-by"] != "kubeapps", nil
  }
  