fix(istio-controlplane): helm works with no tls

chart/templates/istio/controlplane/secret-tls.yaml

@@ -6,7 +6,7 @@ For backwards compatibility, get key/cert from .Values.istio.ingress
 {{- $default := .Values.istio.ingress | default dict -}}
 
 {{- range $name, $values := .Values.istio.gateways }}
-{{- if or (and $values.tls.cert $values.tls.key) (and $default.cert $default.key) }}
+{{- if or (and (dig "tls" "cert" "" $values) (dig "tls" "key" "" $values)) (and $default.cert $default.key) }}
 apiVersion: v1
 kind: Secret
 metadata: