if no dataset is loaded yet and import from CFP button is pressed, it should switch to the new content page with the "show" and "publish" button, as well as allowing to save that xls file.
Give a warning if timeslotList or roomList is empty (fail fast won't allow us to check if other fields are imported correctly)
This is "import from Devoxx CFP" specific. Mention something like: "There are timeslots/rooms. Log into the CFP webapp, open the tab configuration and add the timeslots/rooms before importing it here."
Geoffrey: I am ok with fail-fasting (throw IllegalStateException that gets automatically shown in the UI afterward) or with a pop-up warning (log warning is not enough).
In Import from CFP, importTalkList only imports the accepted talks, should import both accepted and approved ones.
Enhancement
Major