Internal server error when trying to Kepubify a bad file

[johanbrook]

Maybe this is https://github.com/daniel-j/send2ereader/issues/6, but:

1. Upload a "bad" file, such as [1].
2. Check "Kepubify".
3. Upload.

A page with "Internal server error" is shown. Unchecking "Kepubify" successfully uploads the file.

I uploaded the EPUB to https://pgaskin.net/kepubify/try (online version of Kepubify) and it fails there, which confirms that the file is bad somehow.

Anyhow, I suggest catching this error and presenting it nicely with suggestion to turn off Kepubify.

Thanks for an otherwise super smooth experience <3

[1] https://archive.org/download/dune-saga-collection/Dune%20Saga%20Collection/Frank%20Herbert/Dune%20%28286%29/Dune%20-%20Frank%20Herbert.epub