Use defaults in values.yaml (stable/mongodb) (#5340)

* Use defaults in values.yaml (stable/mongodb)

Also made assignments in `_helpers.tpl` more uniform

* Bump version to 2.0.3

stable/mongodb/Chart.yaml

@@ -1,5 +1,5 @@
 name: mongodb
-version: 2.0.2
+version: 2.0.3
 appVersion: 3.7.3
 description: NoSQL document-oriented database that stores JSON-like documents with dynamic schemas, simplifying the integration of data in content-driven applications.
 keywords:

stable/mongodb/templates/_helpers.tpl

@@ -19,7 +19,8 @@ We truncate at 63 chars because some Kubernetes name fields are limited to this
 Return the proper image name
 */}}
 {{- define "mongodb.image" -}}
-{{- $registryName :=  default .Values.image.registry "docker.io" -}}
-{{- $tag := .Values.image.tag | default "latest" -}}
-{{- printf "%s/%s:%s" $registryName .Values.image.repository $tag -}}
+{{- $registryName :=  .Values.image.registry -}}
+{{- $repositoryName := .Values.image.repository -}}
+{{- $tag := .Values.image.tag -}}
+{{- printf "%s/%s:%s" $registryName $repositoryName $tag -}}
 {{- end -}}