[FIX] base_kanban_stage: Add group_expand & fix method * Add group_expand attr to abstract kanban model, allowing for empty columns * Fix `_read_group_stage_ids` for new API
[FIX] base_kanban_stage: Add group_expand & fix method
* Add group_expand attr to abstract kanban model, allowing for empty columns
* Fix `_read_group_stage_ids` for new API

Vauxoo/server-tools,Vauxoo/server-tools,Vauxoo/server-tools