[ Merge of http://go/wvgerrit/210651 ]
The Android FileSystem implementation for List() would return an error
if the directory does not exist. This creates an issue for the case
where the CDM attempts to list offline licenses after clearing all
data. This typically won't effect a regular user, it causes
integration tests which re-provision to fail.
Bug: 372105842
Test: file_store_unittest on Oriole
Change-Id: I121b52ab95e36249ae5b196e987bc950a278131f
39c12039cb