Our wrapper script for building static media attempted to honor the

exit code of the collectstatic management command, passing it along to

sys.exit() so that we wouldn't have a failure show up as a successful

result.
However, exit codes are never returned. Instead, we were always getting

None back, which Python helpfully converts to an exit code of 0. Any

failure would have been an explicit sys.exit(1) or a raised exception.

So what we were doing was pointless.
On Django 1.11, though, we actually got a result back: The result of

stdout. We were then passing this to sys.exit(), which Python was

converting to an exit code of 1, resulting in the command always

failing.
We now just exit normally without trying to be clever and helpful,

letting Django do its own thing.

Built static media on Django 1.11 successfully.