- HierarchyInspectionView: fix crash that occured when locking an empty search result set.
- HierarchyInspectionView: fix crash that occured when locking an empty search result set.

zhukaixy/open3mod,dayo7116/open3mod,acgessler/open3mod,zhukaixy/open3mod,acgessler/open3mod,dayo7116/open3mod