FWIW, I was able to modify the GumboInterface code to inject an empty title tag into head if one is missing. I have also changed it to coerce all doctypes to either epub2 or epub3 standard.
These changes should appear in the next release. But please understand gumbo is not Tidy so empty open/close tags without attributes are not auto-removed, and etc. If a user see lots of empty open/close tags and wants them removed, he/she can simply use global find and replace to handle that.
Hope this helps.
KevinH
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