Why a question can exist with no tags?
For example https://math.stackexchange.com/posts/613902/revisions.
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1$\begingroup$ Looks like this is a bug with suggested edits, there's another instance of this on a different site: gaming.stackexchange.com/posts/147067/revisions $\endgroup$ – user9733 Dec 20 '13 at 14:36
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$\begingroup$ I concur, this is a bug. $\endgroup$ – Alex Becker Dec 20 '13 at 15:48
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$\begingroup$ Although I don't think it happened in this case, something similar can happen when a question is migrated to M.SE and none of the tags exist as tags here, although I think it actually gives the question the tag (no-tags). $\endgroup$ – Dan Rust Dec 20 '13 at 22:08
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2$\begingroup$ @Daniel I thought it was untagged. $\endgroup$ – Cole Johnson Dec 21 '13 at 1:15
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$\begingroup$ @ColeJohnson That's likely. I just recalled from (a rather poor) memory. $\endgroup$ – Dan Rust Dec 21 '13 at 1:18
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$\begingroup$ Either way, this is a duplicate of a MSO post. $\endgroup$ – Cole Johnson Dec 21 '13 at 1:25
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$\begingroup$ @Cole Johnson: Thanks for telling us that untagged question will fall into the untagged "tag". $\endgroup$ – Harry Peter Dec 21 '13 at 7:02
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$\begingroup$ @ColeJohnson, can you link to the MSO post, perhaps by editing it into the top of the question? $\endgroup$ – dfeuer Dec 22 '13 at 14:43
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Thanks for the report.
We did a major tag change on Dec. 20th, this introduced this bug and was fixed an hour later on the same day.
