Added an error handling of invalid exercise answers. Now user should …

lovelace-dev-org / lovelace

Interactive Learning Environment

University of Illinois/NCSA Open Source License

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Added an error handling of invalid exercise answers. Now user should … #6

Closed misalmi closed 9 years ago

misalmi commented 9 years ago

…receive proper messages if they are trying to send their answers without logging in or to answer an file upload exercise without selecting any files, instead of errors.