Follows-up If8ff31b530dfbd882. Now that we have resolveStubbornly,
we don't need to filter out unknown modules ahead of time.
Aside from removing the needless filter condition, it also has
the benefit of causing a message to be logged to the console,
which can help discover problems. Previously these were silently
ignored.
Change-Id: I700db4931dfd0a412a8eca66c4a74b8831ab0086