Fixed configmap dashboard problems, when no custom files are provided. (#11034)

Signed-off-by: Niklas Voss <niklas.voss@gmail.com>

stable/prometheus-operator/Chart.yaml

@@ -9,7 +9,7 @@ name: prometheus-operator
 sources:
   - https://github.com/coreos/prometheus-operator
   - https://coreos.com/operators/prometheus
-version: 2.2.6
+version: 2.2.7
 appVersion: 0.26.0
 home: https://github.com/coreos/prometheus-operator
 keywords:

stable/prometheus-operator/templates/grafana/configmap-dashboards.yaml

@@ -1,8 +1,10 @@
 {{- if and .Values.grafana.enabled .Values.grafana.defaultDashboardsEnabled }}
+{{- $files := .Files.Glob "dashboards/*.json" }}
+{{- if $files }}
 apiVersion: v1
 kind: ConfigMapList
 items:
-{{- range $path, $fileContents := .Files.Glob "dashboards/*.json" }}
+{{- range $path, $fileContents := $files }}
 {{- $dashboardName := regexReplaceAll "(^.*/)(.*)\\.json$" $path "${2}" }}
 - apiVersion: v1
   kind: ConfigMap
@@ -17,4 +19,5 @@ items:
   data:
     {{ $dashboardName }}.json: {{ $.Files.Get $path | toJson }}
 {{- end }}
-{{- end }}
+{{- end }}
+{{- end }}