Try to import an invalid file such as invalid.json. The page says "Something went wrong. Check the JS console for more details."
Now try to import a valid file such as simple.json. The page says "Something went wrong. Check the JS console for more details." even though this second file is valid.
Explanation of the fix (copied from the commit message):
We need to clear the error flag, otherwise once there is an error and we display "Something went wrong" we will keep displaying that forever even when the user imports a valid file.
Steps to reproduce:
Explanation of the fix (copied from the commit message):