ceph: helm chart fix for rook-ceph

Go's template language doesn't treat infix `and` as a short-circuit,
which led to fatal errors after an update in Go 1.14 surfaced that as
a fatal error.  This commit removes the infix `and` and replaces it with
a default dict to handle the case of a missing Heml value.

Closes: https://github.com/rook/rook/issues/5378
Signed-off-by: Judson <nyarly@gmail.com>

cluster/charts/rook-ceph/templates/clusterrole.yaml

@@ -281,7 +281,8 @@ rules:
   verbs:
   - get
   - list
-{{- if ((.Values.agent) and .Values.agent.mountSecurityMode) and ne .Values.agent.mountSecurityMode "Any" }}
+# Use a default dict to avoid 'can't give argument to non-function' errors from text/template
+{{- if ne ((.Values.agent | default (dict "mountSecurityMode" "")).mountSecurityMode) "Any" }}
 ---
 apiVersion: rbac.authorization.k8s.io/v1beta1
 kind: ClusterRole