fix(argo-workflows): Avoid "namespace: null" when singleNamespace is true (#1154)

Signed-off-by: darklore <zodiac.brave.story@gmail.com>

charts/argo-workflows/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v2
 name: argo-workflows
 description: A Helm chart for Argo Workflows
 type: application
-version: 0.11.0
+version: 0.11.1
 appVersion: v3.2.7
 icon: https://raw.githubusercontent.com/argoproj/argo-workflows/master/docs/assets/argo.png
 home: https://github.com/argoproj/argo-helm
@@ -15,4 +15,4 @@ maintainers:
   - name: benjaminws
 annotations:
   artifacthub.io/changes: |
-    - "[Added]: Workflow Controller Volumes and VolumeMounts parameters"
+    - "[Fixed]: Avoid "namespace: null" when singleNamespace is true"

charts/argo-workflows/templates/controller/workflow-rb.yaml

@@ -5,7 +5,9 @@ apiVersion: rbac.authorization.k8s.io/v1
 kind: RoleBinding
 metadata:
   name: {{ template "argo-workflows.fullname" $ }}-workflow
-  namespace: {{ $namespace }}
+    {{- with $namespace }}
+  namespace: {{ . }}
+    {{- end }}
 roleRef:
   apiGroup: rbac.authorization.k8s.io
   kind: Role