geermc4/spree_option_is_product — pull request #6 by rubenrails (2013-07-19 00:31:47+00:00)
Title: Fix bug introduced in 79ddc2e8e8

Order#find_line_item_by_variant is used internally by spree she adding a
line_item to an order, we can't stop using that method's name if we want
to detect the correct line_item