Testing for _mainQmlWidgetHolder before blindly assuming it is valid.
Testing for _mainQmlWidgetHolder before blindly assuming it is valid.

remspoor/qgroundcontrol,ethz-asl/qgc_asl,ethz-asl/qgc_asl,catch-twenty-two/qgroundcontrol,kd0aij/qgroundcontrol,RedoXyde/PX4_qGCS,cfelipesouza/qgroundcontrol,CornerOfSkyline/qgroundcontrol,kd0aij/qgroundcontrol,mihadyuk/qgroundcontrol,cfelipesouza/qgroundcontrol,Hunter522/qgroundcontrol,scott-eddy/qgroundcontrol,ethz-asl/qgc_asl,remspoor/qgroundcontrol,ethz-asl/qgc_asl,scott-eddy/qgroundcontrol,ethz-asl/qgc_asl,mihadyuk/qgroundcontrol,remspoor/qgroundcontrol,mihadyuk/qgroundcontrol,remspoor/qgroundcontrol,cfelipesouza/qgroundcontrol,mihadyuk/qgroundcontrol,kd0aij/qgroundcontrol,scott-eddy/qgroundcontrol,cfelipesouza/qgroundcontrol,Hunter522/qgroundcontrol,catch-twenty-two/qgroundcontrol,RedoXyde/PX4_qGCS,catch-twenty-two/qgroundcontrol,kd0aij/qgroundcontrol,scott-eddy/qgroundcontrol,scott-eddy/qgroundcontrol,remspoor/qgroundcontrol,catch-twenty-two/qgroundcontrol,RedoXyde/PX4_qGCS,remspoor/qgroundcontrol,cfelipesouza/qgroundcontrol,CornerOfSkyline/qgroundcontrol,CornerOfSkyline/qgroundcontrol,scott-eddy/qgroundcontrol,RedoXyde/PX4_qGCS,mihadyuk/qgroundcontrol,RedoXyde/PX4_qGCS,CornerOfSkyline/qgroundcontrol,Hunter522/qgroundcontrol,catch-twenty-two/qgroundcontrol,CornerOfSkyline/qgroundcontrol,catch-twenty-two/qgroundcontrol,Hunter522/qgroundcontrol,mihadyuk/qgroundcontrol,Hunter522/qgroundcontrol,Hunter522/qgroundcontrol,RedoXyde/PX4_qGCS,kd0aij/qgroundcontrol,CornerOfSkyline/qgroundcontrol,cfelipesouza/qgroundcontrol,kd0aij/qgroundcontrol