I have made two changes to my description-python-code ... one is the weird, and by intention broken link to the log, that is not updated for over a year anyways.
I don't think that will be the cause, but I took that out now.
Apr 26 2019
Apr 21 2019
Usually, a null edit (nothing changed) will result in that: a null edit with no history, and no edit on the account.
For some reason, I sometimes run into null-edits that do leave a trace, for the moment I can not see why that does happen, to me it looks like a small bug in the wikisoftware in the Wikidata-area.
These edits are already there for quite a while, and updating the pywikibot repo on my machine will not solve the issue.
I have only seen this when updating descriptions and/or labels, when the actual update in the end does not really make a change.