liquid_feedback_frontend: model/setting

liquid_feedback_frontend

Fixed error when listing issues with zero population

rev	line source
bsw@11	1 SettingMap = mondelefant.new_class()
bsw@11	2 SettingMap.table = 'setting_map'
bsw@11	3 SettingMap.primary_key = { "key", "subkey" }