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There shouldn’t be a case where we see a `ValueError` on upload any more. Our file handling should be robust enough to deal with whatever is thrown at it. This commit: - adds test files with bad data (PNG files with their extensions changed to look like spreadsheets) - catches whatever exceptions are raised by trying to parse these files - returns a helpful flash message to the user Anything else should raise a `500`, eg if the file can’t be uploaded to S3.