Looking at the code, no, it wasn't fixed. But, I remember looking at where it is failing some time recently and doing something that I thought did fix this. Or that one of the other logging changes would fix it. Obviously not.
I did work out how to reproduce it. I needed to convert a book that calibre didn't have a cover for, and there wasn't one in the book. Converting a TXT file worked to do it.
The attached beta fixes it here. I changed the logging a little bit. Hopefully I didn't break something elsewhere.
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