Issue340 - MyModule shouldn't be indexed

This resolves #340.
Final change here.  :)  Based on my earlier comment re `is` vs `ok`, for a boolean, it's going to be clearer to test for `ok( $file->is_in_test_directory() ... )` or `ok( ! $file->is_in_test_directory() ...)` rather than checking that the false value is specifically an empty string.  Since `undef` or `0` will also evaluate to false, it's going to be clearer if we just check true/false.