Reaching «Before a save, there is nothing to load» not supported yet

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From the setup of Planning a mission.

Given the game clock is off
  And the link is connected
  And the vehicle is disarmed
  And the autopilot mode is MANUAL
  And the map tool is PLAN
  And the plan has 0 items
  And the plan altitude is 40 m
  And the last plan item is none
  And the takeoff is not planned
  And the vehicle mission is empty
  And the home position is set
  And the waypoints are unchecked
  And the mission file is missing
  And the measured distance is hidden
  And the vehicle's current item is 0
  And the plane is on the ground

• the game clock is off · arranged
• the link is connected · arranged
• the vehicle is disarmed · arranged
• the autopilot mode is MANUAL · arranged
• the map tool is PLAN · arranged
• the plan has 0 items · arranged
• the plan altitude is 40 m · arranged
• the last plan item is none · arranged
• the takeoff is not planned · arranged
• the vehicle mission is empty · arranged
• the home position is set · arranged
• the waypoints are unchecked · arranged
• the mission file is missing · arranged
• the measured distance is hidden · arranged
• the vehicle's current item is 0 · arranged
• the plane is on the ground · arranged

1 When the operator loads the plan from the file

When the operator loads the plan from the file

Expected behaviour: Before a save, there is nothing to load.

• the plan has 0 items · Before a save, there is nothing to load
• the last plan item is none · An empty plan has no last item