fix(core): A NodeId with an empty string is also considered "Null"
fix(core): A NodeId with an empty string is also considered "Null"

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