E-Mail-Notification Templates - Received mails are blank.

[2xDIYGN]

Describe the bug

A clear and concise description of what the bug is.

When receiving a E-Mail notifiation while branding is enabled with a custom mail-template the standard message body is blank.

Steps to reproduce

1. Deploy ocis 5.0.7 with Helm
2. Enable e-mail Notifications branding and add configrefs containing Mail-Template in the values.yaml
3. Send a test mail by adding a user to a space

Expected behavior

A clear and concise description of what you expected to happen.

E-Mail notifications should contain the standard message body when using a custom template. If the branding is disabled the standard message body is being correctly send.

Actual behavior

A clear and concise description of what happened.

Setup

Please describe how you started the server and provide a list of relevant environment variables or configuration files. ocis 5.0.7 deployed with HELM

This is how the received mail looks like:

And this is the source html of the received mail:

Following email.text.tmpl and email.html.tmpl were used in configmaps:

```console OCIS_XXX=somevalue OCIS_YYY=somevalue PROXY_XXX=somevalue ```

Additional context

Add any other context about the problem here.

[fschade]

Thanks for the Report, can you please Share the config and Template as gist?

[2xDIYGN]

Hello, here is the link: https://gist.github.com/2xDIYGN/d2d8036c41dce4d060779c02127356bf