default value '' for nil configmap values

3node/helm-charts/adminutil/templates/configmap.yaml

 apiVersion: v1
 data:
   {{- range $key, $val := .Values.adminutilenv }}
-  {{ $key }}: {{ $val }}
+  {{ $key }}: {{default "''" $val }}
   {{- end }}
 kind: ConfigMap
 metadata:

3node/helm-charts/apimanager/templates/configmap.yaml

 apiVersion: v1
 data:
   {{- range $key, $val := .Values.apimanagerenv }}
-  {{ $key }}: {{ $val }}
+  {{ $key }}: {{default "''" $val }}
   {{- end }}
   {{- range $key, $val := .Values.apimanagerenvOptional }}
-  {{ $key }}: {{ $val }}
+  {{ $key }}: {{default "''" $val }}
   {{- end }}
 kind: ConfigMap
 metadata:
   creationTimestamp: null
   name: {{ .Chart.Name }}-config
-  namespace: {{ .Values.namespace }}
\ No newline at end of file
+  namespace: {{ .Values.namespace }}

3node/helm-charts/cert/templates/configmap.yaml

 apiVersion: v1
 data:
   {{- range $key, $val := .Values.certenv }}
-  {{ $key }}: {{ $val }}
+  {{ $key }}: {{default "''" $val }}
   {{- end }}
 kind: ConfigMap
 metadata:

3node/helm-charts/content/templates/configmap.yaml

 apiVersion: v1
 data:
   {{- range $key, $val := .Values.contentenv }}
-  {{ $key }}: {{ $val }}
+  {{ $key }}: {{default "''" $val }}
   {{- end }}
   sunbird_cassandra_replication_strategy: {{ .Values.sunbird_cassandra_replication_strategy | toJson }}
 kind: ConfigMap
 metadata:
   creationTimestamp: null
   name: {{ .Chart.Name }}-config
-  namespace: {{ .Values.namespace }}
\ No newline at end of file
+  namespace: {{ .Values.namespace }}

3node/helm-charts/enc/templates/configmap.yaml

 apiVersion: v1
 data:
   {{- range $key, $val := .Values.encenv }}
-  {{ $key }}: {{ $val }}
+  {{ $key }}: {{default "''" $val }}
   {{- end }}
 kind: ConfigMap
 metadata:

3node/helm-charts/learner/templates/configmap.yaml

 apiVersion: v1
 data:
   {{- range $key, $val := .Values.learnerenv }}
-  {{ $key }}: {{ $val }}
+  {{ $key }}: {{default "''" $val }}
   {{- end }}
 kind: ConfigMap
 metadata:

3node/helm-charts/lms/templates/configmap.yaml

 apiVersion: v1
 data:
   {{- range $key, $val := .Values.lmsenv }}
-  {{ $key }}: {{ $val }}
+  {{ $key }}: {{default "''" $val }}
   {{- end }}
 kind: ConfigMap
 metadata:

3node/helm-charts/notification/templates/configmap.yaml

 apiVersion: v1
 data:
   {{- range $key, $val := .Values.notificationenv }}
-  {{ $key }}: {{ $val }}
+  {{ $key }}: {{default "''" $val }}
   {{- end }}
 kind: ConfigMap
 metadata:

3node/helm-charts/telemetry/templates/configmap.yaml

 apiVersion: v1
 data:
   {{- range $key, $val := .Values.telemetryenv }}
-  {{ $key }}: {{ $val }}
+  {{ $key }}: {{default "''" $val }}
   {{- end }}
 kind: ConfigMap
 metadata:

3node/helm-charts/userorg/templates/configmap.yaml

 apiVersion: v1
 data:
   {{- range $key, $val := .Values.userorgenv }}
-  {{ $key }}: {{ $val }}
+  {{ $key }}: {{default "''" $val }}
   {{- end }}
 kind: ConfigMap
 metadata: