fix(server): Call AddNode_finish on auto-generated mandatory children
fix(server): Call AddNode_finish on auto-generated mandatory children

backported from commit 8bcadb28f571a2d19f44afc8737b97fae4be8ae9

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