[prometheus-operator] grafana configmap for dashboards needs global scope in range function

[mmerrill3]

Describe the bug
Within the template grafana/configmap-dashboards.yaml there is a range function. The call to the template function

namespace: {{ template "prometheus-operator.namespace" . }}

needs to be passed the global scope like this:

namespace: {{ template "prometheus-operator.namespace" $ }}

Otherwise, helm cannot evaluate the scope and will not be able to render the chart.

Version of Helm and Kubernetes:
helm 2.16.8
kubernetes 1.18.4

Which chart:
prometheus-operator

What happened:
Scope does not have the namespaceOverride value, so an error is thrown:

Error: UPGRADE FAILED: render error in "prometheus-operator/templates/grafana/configmap-dashboards.yaml": template: prometheus-operator/templates/_helpers.tpl:88:16: executing "prometheus-operator.namespace" at <.Values.namespaceOverride>: can't evaluate field Values in type []uint8

What you expected to happen:

No errors

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know: