Fix sdb_ns_path() for NULL and empty paths
Fix sdb_ns_path() for NULL and empty paths

alvarofe/sdb,pombredanne/sdb,Maijin/sdb,Maijin/sdb,Maijin/sdb,Maijin/sdb,alvarofe/sdb,alvarofe/sdb,alvarofe/sdb,pombredanne/sdb,alvarofe/sdb,Maijin/sdb,pombredanne/sdb,Maijin/sdb,radare/sdb,radare/sdb,pombredanne/sdb,alvarofe/sdb,radare/sdb,radare/sdb,radare/sdb,alvarofe/sdb,pombredanne/sdb,Maijin/sdb,Maijin/sdb,pombredanne/sdb,pombredanne/sdb,alvarofe/sdb,radare/sdb,radare/sdb,Maijin/sdb,Maijin/sdb,radare/sdb,alvarofe/sdb,Maijin/sdb,radare/sdb,radare/sdb,alvarofe/sdb,pombredanne/sdb,pombredanne/sdb,alvarofe/sdb,pombredanne/sdb,radare/sdb,pombredanne/sdb