Merge pull request #17402 from artfulrobot/artfulrobot-core-issue-1773
authorEileen McNaughton <emcnaughton@wikimedia.org>
Tue, 26 May 2020 20:24:19 +0000 (08:24 +1200)
committerGitHub <noreply@github.com>
Tue, 26 May 2020 20:24:19 +0000 (08:24 +1200)
Fix core#1773 unsubscribe form causes errors if submitted twice


Trivial merge