Work around the fact that empty directories are not present in an .apk

The SDK tooling that constructs .apk packages doesn't put empty
directories in them. Which makes sense I guess. "Hidden" files (like
.gitignore) are also skipped. So a directory like
sc/qa/unit/qpro/indeterminate does not show up at all.

So, we must pretend that any opendir() of a directory under /assets
succeeds. If the .apk doesn't contain any files in such a directory,
treat it as existing but empty. We can't know if the corresponding
directory from which /assets was constructed actually does exist but
is empty or if it doesn't exist.

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