string.c: empty string is not invalid
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38617 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
string.c: empty string is not invalid
valid or 7bit.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38617 b2dd03c8-39d4-4d8f-98ff-823fe69b080e