fix: file input handler

[DmytroAlipov]

This is a backport from the master branch.

hasFile run only once, it will always be null

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (open-release/palm.master@3644172). Click here to learn what that means.

Additional details and impacted files

@@                     Coverage Diff                      @@
##             open-release/palm.master      #371   +/-   ##
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  Coverage                            ?   100.00%           
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  Files                               ?       122           
  Lines                               ?      1268           
  Branches                            ?       249           
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  Hits                                ?      1268           
  Misses                              ?         0           
  Partials                            ?         0           

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[mphilbrick211]

Hi @openedx/content-aurora! I think this is ready for merge, the master has already been merged.

[cmltaWt0]

Looked through the diff - looks exactly the same as for master.
Seems safe to merge.
Merging.

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