Fixed a bug in moving mission elements up/down, that used to crash the QGC
Fixed a bug in moving mission elements up/down, that used to crash the QGC

RedoXyde/PX4_qGCS,josephlewis42/UDenverQGC2,mihadyuk/qgroundcontrol,gpaes/apm_planner,lis-epfl/qgroundcontrol,diydrones/apm_planner,LittleBun/apm_planner,hejunbok/apm_planner,fizzaly/qgroundcontrol,nado1688/qgroundcontrol,LIKAIMO/qgroundcontrol,LIKAIMO/qgroundcontrol,dcarpy/apm_planner,josephlewis42/UDenverQGC2,LittleBun/apm_planner,fizzaly/qgroundcontrol,dagoodma/qgroundcontrol,caoxiongkun/qgroundcontrol,hejunbok/qgroundcontrol,ethz-asl/qgc_asl,abcdelf/apm_planner,caoxiongkun/qgroundcontrol,Hunter522/qgroundcontrol,jy723/qgroundcontrol,sutherlandm/apm_planner,hejunbok/qgroundcontrol,devbharat/qgroundcontrol,TheIronBorn/qgroundcontrol,devbharat/qgroundcontrol,gpaes/apm_planner,LIKAIMO/qgroundcontrol,caoxiongkun/qgroundcontrol,CornerOfSkyline/qgroundcontrol,chen0510566/apm_planner,UAVenture/qgroundcontrol,hejunbok/qgroundcontrol,xros/apm_planner,mrpilot2/apm_planner,kd0aij/qgroundcontrol,labtoast/apm_planner,TheIronBorn/qgroundcontrol,catch-twenty-two/qgroundcontrol,mrpilot2/apm_planner,cfelipesouza/qgroundcontrol,fizzaly/qgroundcontrol,duststorm/apm_planner,iidioter/qgroundcontrol,remspoor/qgroundcontrol,sverling/qgc_asl,nado1688/qgroundcontrol,TheIronBorn/qgroundcontrol,diydrones/apm_planner,ethz-asl/qgc_asl,BMP-TECH/qgroundcontrol,CornerOfSkyline/qgroundcontrol,mihadyuk/qgroundcontrol,jy723/qgroundcontrol,CornerOfSkyline/qgroundcontrol,381426068/apm_planner,dagoodma/qgroundcontrol,chen0510566/apm_planner,RedoXyde/PX4_qGCS,ethz-asl/qgc_asl,LIKAIMO/apm_planner,BMP-TECH/qgroundcontrol,kd0aij/qgroundcontrol,Icenowy/apm_planner,ethz-asl/qgc_asl,UAVenture/qgroundcontrol,labtoast/apm_planner,greenoaktree/qgroundcontrol,xros/apm_planner,scott-eddy/qgroundcontrol,sverling/qgc_asl,dcarpy/apm_planner,caoxiongkun/qgroundcontrol,diydrones/apm_planner,mirkix/apm_planner,chen0510566/apm_planner,mirkix/apm_planner,catch-twenty-two/qgroundcontrol,sutherlandm/apm_planner,labtoast/apm_planner,Hunter522/qgroundcontrol,catch-twenty-two/qgroundcontrol,kd0aij/qgroundcontrol,jy723/qgroundcontrol,lis-epfl/qgroundcontrol,greenoaktree/qgroundcontrol,UAVenture/qgroundcontrol,scott-eddy/qgroundcontrol,Icenowy/apm_planner,LIKAIMO/qgroundcontrol,scott-eddy/qgroundcontrol,mrpilot2/apm_planner,xros/apm_planner,cfelipesouza/qgroundcontrol,xros/apm_planner,LittleBun/apm_planner,scott-eddy/qgroundcontrol,hejunbok/apm_planner,mirkix/apm_planner,duststorm/apm_planner,mirkix/apm_planner,hejunbok/qgroundcontrol,kellyschrock/apm_planner,TheIronBorn/qgroundcontrol,381426068/apm_planner,kellyschrock/apm_planner,diydrones/apm_planner,hejunbok/apm_planner,mirkix/apm_planner,dagoodma/qgroundcontrol,kd0aij/qgroundcontrol,caoxiongkun/qgroundcontrol,scott-eddy/qgroundcontrol,duststorm/apm_planner,cfelipesouza/qgroundcontrol,lis-epfl/qgroundcontrol,jy723/qgroundcontrol,LittleBun/apm_planner,dagoodma/qgroundcontrol,LIKAIMO/qgroundcontrol,remspoor/qgroundcontrol,dagoodma/qgroundcontrol,UAVenture/qgroundcontrol,josephlewis42/UDenverQGC2,greenoaktree/qgroundcontrol,cfelipesouza/qgroundcontrol,greenoaktree/qgroundcontrol,TheIronBorn/qgroundcontrol,jy723/qgroundcontrol,LIKAIMO/apm_planner,mihadyuk/qgroundcontrol,381426068/apm_planner,xros/apm_planner,duststorm/apm_planner,cfelipesouza/qgroundcontrol,remspoor/qgroundcontrol,cfelipesouza/qgroundcontrol,iidioter/qgroundcontrol,catch-twenty-two/qgroundcontrol,WorkerBees/apm_planner,remspoor/qgroundcontrol,iidioter/qgroundcontrol,BMP-TECH/qgroundcontrol,CornerOfSkyline/qgroundcontrol,LittleBun/apm_planner,RedoXyde/PX4_qGCS,xros/apm_planner,gpaes/apm_planner,sverling/qgc_asl,Hunter522/qgroundcontrol,LIKAIMO/apm_planner,dcarpy/apm_planner,iidioter/qgroundcontrol,caoxiongkun/qgroundcontrol,greenoaktree/qgroundcontrol,WorkerBees/apm_planner,mrpilot2/apm_planner,BMP-TECH/qgroundcontrol,mirkix/apm_planner,jy723/qgroundcontrol,greenoaktree/qgroundcontrol,mihadyuk/qgroundcontrol,scott-eddy/qgroundcontrol,CornerOfSkyline/qgroundcontrol,381426068/apm_planner,iidioter/qgroundcontrol,abcdelf/apm_planner,RedoXyde/PX4_qGCS,fizzaly/qgroundcontrol,381426068/apm_planner,sverling/qgc_asl,kellyschrock/apm_planner,Icenowy/apm_planner,abcdelf/apm_planner,CornerOfSkyline/qgroundcontrol,mrpilot2/apm_planner,LIKAIMO/qgroundcontrol,lis-epfl/qgroundcontrol,kellyschrock/apm_planner,abcdelf/apm_planner,BMP-TECH/qgroundcontrol,Hunter522/qgroundcontrol,LIKAIMO/apm_planner,gpaes/apm_planner,WorkerBees/apm_planner,devbharat/qgroundcontrol,ethz-asl/qgc_asl,devbharat/qgroundcontrol,UAVenture/qgroundcontrol,chen0510566/apm_planner,fizzaly/qgroundcontrol,fizzaly/qgroundcontrol,diydrones/apm_planner,dcarpy/apm_planner,hejunbok/apm_planner,nado1688/qgroundcontrol,mrpilot2/apm_planner,labtoast/apm_planner,josephlewis42/UDenverQGC2,hejunbok/qgroundcontrol,gpaes/apm_planner,LIKAIMO/apm_planner,LittleBun/apm_planner,Icenowy/apm_planner,RedoXyde/PX4_qGCS,Icenowy/apm_planner,hejunbok/apm_planner,sutherlandm/apm_planner,hejunbok/apm_planner,diydrones/apm_planner,WorkerBees/apm_planner,catch-twenty-two/qgroundcontrol,kd0aij/qgroundcontrol,kd0aij/qgroundcontrol,devbharat/qgroundcontrol,TheIronBorn/qgroundcontrol,sverling/qgc_asl,BMP-TECH/qgroundcontrol,remspoor/qgroundcontrol,nado1688/qgroundcontrol,sutherlandm/apm_planner,iidioter/qgroundcontrol,labtoast/apm_planner,abcdelf/apm_planner,duststorm/apm_planner,mihadyuk/qgroundcontrol,RedoXyde/PX4_qGCS,sutherlandm/apm_planner,381426068/apm_planner,labtoast/apm_planner,dagoodma/qgroundcontrol,dcarpy/apm_planner,chen0510566/apm_planner,Hunter522/qgroundcontrol,Hunter522/qgroundcontrol,LIKAIMO/apm_planner,kellyschrock/apm_planner,remspoor/qgroundcontrol,lis-epfl/qgroundcontrol,Icenowy/apm_planner,catch-twenty-two/qgroundcontrol,chen0510566/apm_planner,devbharat/qgroundcontrol,UAVenture/qgroundcontrol,sutherlandm/apm_planner,abcdelf/apm_planner,hejunbok/qgroundcontrol,dcarpy/apm_planner,gpaes/apm_planner,nado1688/qgroundcontrol,nado1688/qgroundcontrol,mihadyuk/qgroundcontrol,duststorm/apm_planner,kellyschrock/apm_planner