This question, as of this moment, has a "null" tag. There are four tag "buttons": linux, tools, "null", and threads.
"Retag" simply shows two spaces between "tools" and "threads".
Didn't try to fix it to allow troubleshooting.
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It's a known issue. You can delete the empty tag: meta.stackexchange.com/questions/19013/empty-tag-when-migrating– Ladybug KillerCommented Dec 8, 2009 at 21:11
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2 Answers
That tag was belongs-on-serverfault when the question was on SO. Apparently something went wrong with the auto-removal of belongs-on-* tags.
Maybe Jeff is stripping out the "belongs-on-" tags that questions have before they get migrated which is creating an empty tag.
This might get fixed by the daily vote sync script.
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They've been stripped out for some time, but I've never seen one turn into a blank tag before.– mmyersCommented Dec 8, 2009 at 21:00
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@mmyers, ah, I have never noticed that. I'd hope this isn't being caused because it was tagged as belongs-on-serverfault but instead migrated to SuperUser. :P– BrandonCommented Dec 8, 2009 at 21:10