[rubygems/rubygems] Don't try to remove previous install folder if it's empty

Ruby ships with empty directories for default gems. If Ruby
installations has unsafe world-writable permissions, we will complain
when about to install a gem that happens to be also a default gem,
because we'll start by removing the previous install folder and that's
supposed to be insecure due to too loose permissions.

However, if the folder is empty, we don't actually need to remove
anything, so we can skip the whole thing, avoiding the errors.

https://github.com/rubygems/rubygems/commit/2f3cd8ac4e

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