Fixed clientside bug when activating sessions on servers that send an empty anonymous identity token (len -1).
Fixed clientside bug when activating sessions on servers that send an empty anonymous identity token (len -1).

open62541/open62541,jpfr/open62541,jpfr/open62541,bostjanv/open62541,JGrothoff/open62541,bostjanv/open62541,StalderT/open62541,open62541/open62541,open62541/open62541,StalderT/open62541,JGrothoff/open62541,open62541/open62541,JGrothoff/open62541,AGIsmail/open62541,jpfr/open62541,AGIsmail/open62541,jpfr/open62541,StalderT/open62541,StalderT/open62541,JGrothoff/open62541