This is because lp.app.browser.webservice.reference_xhtml_representation assumes that the webservice field name matches the model attribute name, which is not the case here because exported_as is used to rename "duplicateof" to "duplicate_of". getattr returns none, and format_link's empty_value is returned.
This is because lp.app. browser. webservice. reference_ xhtml_represent ation assumes that the webservice field name matches the model attribute name, which is not the case here because exported_as is used to rename "duplicateof" to "duplicate_of". getattr returns none, and format_link's empty_value is returned.