Remove null pointer in oca plugin schema

[jamshale]

Not sure when this broke but the variable this schema example reference must have been removed. Also the marshmallow library might have changed. It should probably have been using named references.

Weird it didn't throw errors.

Should consider running the ruff linting on the plugins to catch something like this.

[esune]

@jamshale is linting set-up in the plugins repo such that we could follow that example to lint plugins here that will not be moved?

[github-actions]

Deployment	Resource	Location
Traction
	Tenant UI	https://pr-909-traction-tenant-ui-dev.apps.silver.devops.gov.bc.ca
	Innkeeper UI	https://pr-909-traction-tenant-ui-dev.apps.silver.devops.gov.bc.ca/innkeeper
Aca-Py
	Admin Swagger	https://pr-909-traction-acapy-admin-dev.apps.silver.devops.gov.bc.ca/api/doc
	Tenant Proxy Swagger	https://pr-909-traction-tenant-proxy-dev.apps.silver.devops.gov.bc.ca/api/doc

Deployment URLs ready for review.

[jamshale]

@esune There is now yes. You install a poetry plugin and then navigate to the repo and then run poetry run ruff check .
It's pretty simple. My vscode picked this up right away though, because I have the ruff extension installed.

[jamshale]

@esune Actually the plugins in traction aren't using ruff yet. Maybe they should be updated to use ruff and then conform to the same rules as acapy like the plugin repo. I think this could wait until we remove the plugins that are already in the plugin repo.