objectbrowser/add - hostgroup_name is not required
objectbrowser/add - hostgroup_name is not required

Fixes #313

kb2ma/adagios,kaji-project/adagios,opinkerfi/adagios,kaji-project/adagios,kaji-project/adagios,opinkerfi/adagios,kb2ma/adagios,zengzhaozheng/adagios,zengzhaozheng/adagios,opinkerfi/adagios,opinkerfi/adagios,kaji-project/adagios,zengzhaozheng/adagios,kb2ma/adagios,zengzhaozheng/adagios,kb2ma/adagios