AccountCache#get returns an empty AccountState to represent a missing
account. AccountResolver is primarily used by AccountsCollection to
parse an string to an AccountResource. If an account is missing callers
of the account REST API expect a ResourceNotFoundException. Likely the
REST API handlers would fail later with ResourceNotFoundException anyway
but it's better to fail early.
Change-Id: Ie7664e099e526e37859dad2ce723bc225c5530b5
Signed-off-by: Edwin Kempin <ekempin@google.com>
2d94db95a5