NodeManagement: Don't delete nodes that are in several hierarchies (fix #2654)
NodeManagement: Don't delete nodes that are in several hierarchies (fix #2654)

StalderT/open62541,open62541/open62541,open62541/open62541,JGrothoff/open62541,JGrothoff/open62541,StalderT/open62541,StalderT/open62541,jpfr/open62541,jpfr/open62541,JGrothoff/open62541,jpfr/open62541,jpfr/open62541,open62541/open62541,StalderT/open62541,open62541/open62541,JGrothoff/open62541