Removing unnecesary line in test

[IMC00]

There is a line in one of the tests that tries to access a class attribute that doesn't exist. While it isn't breaking in any sense, that line is pointless. I've run the tests without the line that they pass appropiately.

[github-actions]

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[github-actions]

This PR touches files which potentially affect the outcome of the tests of an exercise. This will cause all students' solutions to affected exercises to be re-tested.

If this PR does not affect the result of the test (or, for example, adds an edge case that is not worth rerunning all tests for), please add the following to the merge-commit message which will stops student's tests from re-running. Please copy-paste to avoid typos.

[no important files changed]

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