There can be a race between getting the container ids for matches and
getting the actual container. This makes sure that we check that the
container returned by `Get` is non-nil before adding it to the list of
matches.
Fixes#25991
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Upstream-commit: a020ec4c8b476a814eb137e216fe9d723524fc3b
Component: engine