Images not found should raise an exception

[discopatrick]

I need to be able to handle cases where images were not found during write_pdf.

I can see a message logged: Failed to load image at ...: URLError: <urlopen error [Errno 2] No such file or directory: ...

But there's no way for me to catch this when it happens and handle it accordingly.

This was discussed back in #250 but it seems the preference then was to allow image load failures to fail silently and continue rendering the PDF without them.

[liZe]

Hello!

If you want to raise errors when 404 errors are found, the best solution is probably to use a URL fetcher. You’ll then be able to do what you want, according to the result of your HTTP request.

[liZe]

@discopatrick Did this solution work for you?

[liZe]

Feel free to reopen if needed.