Resolve "Cannot add participants to my course"
What does this mr do?
Give a clearer error message to the user when the username provided cannot be found.
Screenshots
before
after
Does this MR meet the acceptance criteria?
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I have added a changelog entry to reflect the significant changes I made. -
Tests were created to test the feature. -
I have updated the documentation accordingly. -
I adhere to the style guide.
Closes #496 (closed)
Edited by Cédric Willekens