Fix import Trello board without swimlanes
Fix import Trello board without swimlanes

GhassenRjab/wekan,johnleeming/wekan,johnleeming/wekan,libreboard/libreboard,wekan/wekan,GhassenRjab/wekan,johnleeming/wekan,wekan/wekan,GhassenRjab/wekan,johnleeming/wekan,wekan/wekan,wekan/wekan,wekan/wekan,libreboard/libreboard