Import/Export Messages Broken

[mAAdhaTTah]

From @benbalter:

I think I might be running into the same issue? Clicking "import" simply reloads the page, with no feedback message on 4.4.1.

[mAAdhaTTah]

I'm getting this when an error (or success) happens fast enough that it's shown on the page that gets redirected away from (to remove the query arg).