There is no patch for this issue, AFAIK. If you use the <p> tag for paragraphs in the calibre comments, your Kobo will insert an empty paragraph there. I've found that the only way to get around this issue is to replace <p> with <br> in the comments. There may be other ways (I dimly remember trying something with metadata plugboards once), but they haven't worked as well for me.
The line-spacing patch decreases line-height, but it doesn't remove the empty paragraphs Kobo readers insert in book descriptions.
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