Fix --test-probe
Fix --test-probe

1. Changes `folder` to `dir.to_s` (`folder` no longer exists).
2. Changes `passing.any?` to `!passing.empty?`, as `any?` has pitfalls:
   Took me a few minutes to debug when I tried with `input_path` that
   was returning `nil` (`[nil].any? #=> false`).

mgreter/sass-spec,sass/sass-spec,mgreter/sass-spec,nschonni/sass-spec,sass/sass-spec,nschonni/sass-spec,nschonni/sass-spec,sass/sass-spec,sass/sass-spec,nschonni/sass-spec,mgreter/sass-spec