Don't expect all Java modules to have a manifest.

Some libraries that go through manifest_check do not have a manifest or
APK, so there is nothing to check LOCAL_USES_LIBRARIES and
LOCAL_OPTIONAL_USES_LIBRARIES against. Handle it as if the manifest had
zero <uses-library> tags: don't fail the build unless the module has
non-empty LOCAL_USES_LIBRARIES or LOCAL_OPTIONAL_USES_LIBRARIES.

Bug: 132357300
Test: lunch cf_x86_64_phone-userdebug && m
Change-Id: I4b1317cfbd93cb6129caba51b56081307a564442