Bugfix: raise error if oeo module is missing

[jh-RLI]

Summary of the discussion

If the order of the modules inside the ontology release folder differs it will display wrong modules on the ontology/oeo page. This PR checks if the oeo module is available.

Type of change (CHANGELOG.md)

Updated

• Check if the oeo module is available in the ontology folder. (#1495)

Workflow checklist

Automation

Closes #

PR-Assignee

• [x] 🐙 Follow the workflow in CONTRIBUTING.md
• [x] 📝 Update the CHANGELOG.md
• [ ] 📙 Update the documentation on mkdocs

Reviewer

• [ ] 🐙 Follow the Reviewer Guidelines
• [ ] 🐙 Provided feedback and show sufficient appreciation for the work done