Revert "Update about_exceptions.rb"

This commit breaks the code.

This reverts commit 110942795c828febe0851fe7093172ad8aad4717.
Fix about_exceptions koan

* Updates code to reflect good style change by JN

* Tests now passing.

[#54145675]
Merge pull request #16 from bayendor/54145675_about_exceptions_master

Fix about_exceptions koan

[Delivers #54145675]