Message section backend fixes

[andreasgangso]

Reproduction steps

• Have an empty page.
• Let it have 1 message section.
• Let that have 1 message.
• Enable and disable the message a few times.

Expected
The item should appear when re-enabled.

Actual
App gets a realtime update but the page query has an exception: OperationException(linkException: null, graphqlErrors: [GraphQLError(message: internal system error, locations: null, path: [section, messages], extensions: null)]). The section fails to load.

Notes
I couldn't see this exact error in api-prod logs?? strange

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Another minor issue:

• Can’t remove templates on this screen: https://admin.brunstad.tv/admin/content/messages/20. Press the X on an item and save. Error: The following fields have invalid values: messages_id: Value can’t be null. I think it's just to change the directus field config (what to do "on deselect". Let it delete the m2m row instead of setting to null)