Forcing a new line to be created in the configmap yaml generation (#5318)

stable/prometheus/Chart.yaml

@@ -1,5 +1,5 @@
 name: prometheus
-version: 6.4.0
+version: 6.4.1
 appVersion: 2.2.1
 description: Prometheus is a monitoring system and time series database.
 home: https://prometheus.io/

stable/prometheus/templates/server-configmap.yaml

@@ -15,7 +15,7 @@ data:
   {{ $key }}: |
 {{ toYaml $value | default "{}" | indent 4 }}
 {{- if eq $key "prometheus.yml" -}}
-{{- if $root.Values.alertmanager.enabled -}}
+{{- if $root.Values.alertmanager.enabled }}
     alerting:
       alertmanagers:
       - kubernetes_sd_configs: