[stable/mongodb] Allow "existingSecret" without setting up non-root user (#12344)

Signed-off-by: Dzianis Dudnik <ddudnik@protonmail.com>

stable/mongodb/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 name: mongodb
-version: 5.13.0
+version: 5.13.1
 appVersion: 4.0.6
 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/statefulset-primary-rs.yaml

@@ -111,7 +111,7 @@ spec:
             value: {{ .Values.mongodbDatabase | quote }}
           {{- end }}
             {{- if .Values.usePassword }}
-            {{- if or .Values.mongodbPassword .Values.existingSecret }}
+            {{- if and .Values.mongodbUsername (or .Values.mongodbPassword .Values.existingSecret) }}
           - name: MONGODB_PASSWORD
             valueFrom:
               secretKeyRef: