numeric.c: fix exception message for nil rounding
numeric.c (rb_num_get_rounding_option): fix exception message for the case of nil rounding mode.
test_float.rb: add an assertion for the above change.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57000 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
numeric.c: fix exception message for nil rounding
numeric.c (rb_num_get_rounding_option): fix exception message
for the case of nil rounding mode.
test_float.rb: add an assertion for the above change.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57000 b2dd03c8-39d4-4d8f-98ff-823fe69b080e