navigator: bring follow me back to life
navigator: bring follow me back to life

The function `mission_item_to_position_setpoint()` is called in
`FollowTarget::update_position_sp()`. The nav_cmd is a
NAV_CMD_DO_FOLLOW_REPOSITION as set earlier in `set_follow_target_item`.

Since `mission_item_to_position_setpointi` returns early because the item
presumably contains no position, the lat/lon of the mission_item are
not copied over to the position_setpoint and therefore the vehicle will
never move in follow me position mode.

dagar/Firmware,jlecoeur/Firmware,jlecoeur/Firmware,mje-nz/PX4-Firmware,mje-nz/PX4-Firmware,mcgill-robotics/Firmware,mcgill-robotics/Firmware,Aerotenna/Firmware,acfloria/Firmware,dagar/Firmware,acfloria/Firmware,PX4/Firmware,acfloria/Firmware,jlecoeur/Firmware,mcgill-robotics/Firmware,Aerotenna/Firmware,PX4/Firmware,PX4/Firmware,jlecoeur/Firmware,Aerotenna/Firmware,krbeverx/Firmware,krbeverx/Firmware,mcgill-robotics/Firmware,PX4/Firmware,mcgill-robotics/Firmware,krbeverx/Firmware,Aerotenna/Firmware,mje-nz/PX4-Firmware,dagar/Firmware,jlecoeur/Firmware,krbeverx/Firmware,acfloria/Firmware,mje-nz/PX4-Firmware,Aerotenna/Firmware,mcgill-robotics/Firmware,dagar/Firmware,mje-nz/PX4-Firmware,mcgill-robotics/Firmware,acfloria/Firmware,Aerotenna/Firmware,jlecoeur/Firmware,dagar/Firmware,PX4/Firmware,PX4/Firmware,mje-nz/PX4-Firmware,acfloria/Firmware,acfloria/Firmware,jlecoeur/Firmware,Aerotenna/Firmware,mje-nz/PX4-Firmware,krbeverx/Firmware,krbeverx/Firmware,dagar/Firmware,PX4/Firmware,dagar/Firmware,jlecoeur/Firmware,krbeverx/Firmware