Fix test_importer.py #3376

[egberts]

Pull Request Checklist

Resolves: #issue-number-here

• [X] Ensured tests pass and (if applicable) updated functional test output
• [X] Conformed to code style guidelines by running appropriate linting tools
• [ ] Added tests for changed code
• [ ] Updated documentation for changed code

[egberts]

Pulled due to mysterious corruption of logger by tests/conftest.py.