Commit 23c891923e (main: make sure view_builder doesn't propagate
semaphore errors) ignored some exceptions that could pop up from the
_build_step/do_build_step() serialized action, since they are "benign"
on stop.
Later there came b56b10a4bb (view_builder: do_build_step: handle
unexpected exceptions) that plugged any exception from the action in
question, regardless of they happen on stop or run-time.
Apparently, the latter commit supersedes the former.
Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>
eaf78fca04