Fix SF#1566719: not creating site-packages (or other target directory) when installing .egg-info for a project that contains no modules or packages, while using --root (as in bdist_rpm).  (Backport from trunk)
Fix SF#1566719: not creating site-packages (or other target directory) when
installing .egg-info for a project that contains no modules or packages,
while using --root (as in bdist_rpm).  (Backport from trunk)

pypa/setuptools,pypa/setuptools,pypa/setuptools