BUG-1601 Fix null pointer in netconf connector for empty schemas node

Change-Id: I501e1fe1b0c1b531af5dc2f6d992a820c8e6a18e
Signed-off-by: Maros Marsalek <mmarsale@cisco.com>
Merge "BUG-1601 Fix null pointer in netconf connector for empty schemas node"