Allow empty argument for OStream#puts
Allow empty argument for OStream#puts

SciRuby/iruby,astroboxio/iruby,astroboxio/iruby,zalt50/iruby,SciRuby/iruby,zalt50/iruby,zalt50/iruby,SciRuby/iruby,zalt50/iruby,SciRuby/iruby,hainesr/iruby,domitry/iruby,Rambatino/pi-ruby,domitry/iruby,Rambatino/pi-ruby,hainesr/iruby