[ruby-core:15825]
* lib/rdoc/ri/driver.rb (RDoc::initialize): allow options to be optional.
* lib/rdoc/ri/driver.rb (RDoc::class_cache): map_dirs may be
empty.
* lib/rdoc/ri/driver.rb (RDoc::get_info_for): revive get_info_for
method. maybe broken.
* lib/rdoc/ri/util.rb (RDoc::initialize): should not use RiError
no more.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@15761 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
