Bugfix of NPE in 'UidManager:printResult'.
Bugfix of NPE in 'UidManager:printResult'.

Signed-off-by: qudongfang <605f1282a4664b415430eddca3abf3bd1a647b9c@gmail.com>

MadDogTechnology/opentsdb,MadDogTechnology/opentsdb,OpenTSDB/opentsdb,OpenTSDB/opentsdb,MadDogTechnology/opentsdb,OpenTSDB/opentsdb