If User talk namespace is Flow-occupied, there is no warning on nonexistent User talk pages that the corresponding user doesn't exist
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	Catrope
	Jun 9 2015, 7:46 PM

Description

On user talk pages for nonexistent users like this one, there is a warning saying the user account corresponding to the User talk page doesn't exist. However, no such warning is displayed if Flow is enabled on the page. I tested this on the beta cluster by using Special:EnableFlow on User talk:Catrope4. Compare this to User talk:Catrope3 which is also for a non-existent user but doesn't have Flow enabled.

While it's not particularly likely that Special:EnableFlow would be used on a user talk page for a nonexistent user, this problem also appears if the entire user talk namespace is occupied by Flow ($wgFlowOccupiedNamespaces[] = NS_USER_TALK;).