parse.y: fix for empty __VA_ARGS__
__VA_ARGS__
##
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58378 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
parse.y: fix for empty
__VA_ARGS__##between a commanand
__VA_ARGS__in the case it is empty, not to end argumentswith a comma.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58378 b2dd03c8-39d4-4d8f-98ff-823fe69b080e