Fix response with corrupted attached file

[cmltaWt0]

Steps to Reproduce:

1. Answer by the user to ORA -> attach corrupted file.
2. As staff go to Instructors tab -> Open responses and choose ora -> Click on View all responses

Actual Result:

An unexpected error occurred. Please click the button below to refresh the page:

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After my edits, it will be displayed in the preview card:

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Note:

I couldn’t figure out how to change the not-very-correct error message Unknown errors without major modifications.
Here you can select an error message.

It's a re-creation of #324

[openedx-webhooks]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (266589b) to head (87a9259).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #467   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          107       107           
  Lines         1080      1081    +1     
  Branches       160       160           
=========================================
+ Hits          1080      1081    +1     

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[sarina]

@cmltaWt0 before I ask Brian to re-review, would you have a chance to reply to his comment from the original PR? #324 (comment)

[cmltaWt0]

@cmltaWt0 before I ask Brian to re-review, would you have a chance to reply to his comment from the original PR? #324 (comment)

Sure, will do. I'll ping you when it's ready for review with addressed comment. 👍