81739c7a66 prevented new windows from working after a restart error,
and full-text tests (and possibly others) create attachments quickly in
a way that was causing init callbacks to receive a TinyMCE editor with
missing functions (possibly because they were already removed?). This
just ignores those errors, which isn't a great solution, but it probably
won't happen in real use, so let's see if it works.
ad6c3f7a09