mavlink: publish values for vision system errors
mavlink: publish values for vision system errors

Sets zero values as a placeholder until mavlink can be updated.

mje-nz/PX4-Firmware,PX4/Firmware,mje-nz/PX4-Firmware,acfloria/Firmware,Aerotenna/Firmware,dagar/Firmware,jlecoeur/Firmware,mcgill-robotics/Firmware,mcgill-robotics/Firmware,jlecoeur/Firmware,PX4/Firmware,krbeverx/Firmware,PX4/Firmware,darknight-007/Firmware,krbeverx/Firmware,PX4/Firmware,mje-nz/PX4-Firmware,dagar/Firmware,mcgill-robotics/Firmware,Aerotenna/Firmware,acfloria/Firmware,krbeverx/Firmware,acfloria/Firmware,krbeverx/Firmware,mcgill-robotics/Firmware,mje-nz/PX4-Firmware,mje-nz/PX4-Firmware,acfloria/Firmware,PX4/Firmware,dagar/Firmware,PX4/Firmware,mje-nz/PX4-Firmware,dagar/Firmware,jlecoeur/Firmware,Aerotenna/Firmware,darknight-007/Firmware,dagar/Firmware,acfloria/Firmware,jlecoeur/Firmware,Aerotenna/Firmware,mcgill-robotics/Firmware,dagar/Firmware,jlecoeur/Firmware,darknight-007/Firmware,Aerotenna/Firmware,acfloria/Firmware,mcgill-robotics/Firmware,krbeverx/Firmware,acfloria/Firmware,Aerotenna/Firmware,PX4/Firmware,jlecoeur/Firmware,jlecoeur/Firmware,krbeverx/Firmware,dagar/Firmware,darknight-007/Firmware,krbeverx/Firmware,mje-nz/PX4-Firmware,mcgill-robotics/Firmware,Aerotenna/Firmware,jlecoeur/Firmware,darknight-007/Firmware