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That's a valid point; empty lines are not recommended in XML and should be removed.
Following the example of comments and ifrits, see http://c2n.me/49PdxzY. Where the arrows are, there shouldn't be lines; the tags should follow each other without empty lines.
Regarding the extra lines in my message, I can only say that it's not a bug in the file, but a bug in the message itself. The extra lines are everywhere except for the very last paragraph (apparently, the wide line spacing from Word turned into new lines... I don't know).
But the issue with the ifrit is more interesting – I don't understand why they appeared! Previously, I encountered a different bug: the absence of line breaks, meaning all the text was written in one line.
And if there were line breaks, but the text editor didn't see them, then it turns out I might have duplicated all the line breaks simply because I was using a buggy notepad... that's incredibly annoying