I've just upgraded to e5e3eb3, and while the problem in T7421 is now fixed, insofar as there is no longer any error message, but it appears that the "Show Tasks Not Blocked By Other Tasks" option is now returning nothing, ever -- not even tasks which have no blocking tasks defined at all.
1. Go to `/maniphest/query/advanced` (in a Phabricator instance with tickets... many, many tickets)
1. Click "Execute" (get many, many tickets)
1. Select "Show Tasks Not Blocked By Other Tasks" on the "Blocked" option
What I see: "No data"
What I should see:
* Tasks that have no blocking tasks defined at all (this is what I got before T7392); and
* Tasks which have blocking tasks that are all resolved.