This EPUB bug brought to you by the IRS and their i1040gi.epub file
Normally government EPUB files are pretty good about making usable EPUB files. But this year only, the IRS's "i1040gi.epub" file (the file with USA government tax information for filing out the very common 1040 tax form) has a subtly malformed epub file. The list of images (EPUB/img) has 28 GIF files which are all fine, and one JPG file (cover-instr-i1040.jpg) which is zero bytes long.
This file fails to load correctly which leads to a cascade of errors.
Solution is to catch the error and silently ignore it. (Technically, I first check for zero-byte files and ignore it, and also catch the exception and ignore it. Both branches were tested, of course)
