Fixed bug in scan handling in front end server: if preferredPositionInResponse was non-present it logged a NULL value.
Fixed bug in scan handling in front end server: if
preferredPositionInResponse was non-present it logged a NULL value.

nla/yaz,nla/yaz,nla/yaz,dcrossleyau/yaz,nla/yaz,dcrossleyau/yaz,dcrossleyau/yaz