removed unnecessary if statement in addLabelTags
removed unnecessary if statement in addLabelTags

bruceauyeung/heapster,burmanm/heapster,huangyuqi/heapster,bluebreezecf/heapster,burmanm/heapster,johanneswuerbach/heapster,huangyuqi/heapster,bruceauyeung/heapster,whuwxl/heapster,andyxning/heapster,Stackdriver/heapster,AlmogBaku/heapster,johanneswuerbach/heapster,adfin/statster,bluebreezecf/heapster,krzyzacy/heapster,piosz/heapster,krzyzacy/heapster,Stackdriver/heapster,adfin/statster,AlmogBaku/heapster,luxas/heapster,piosz/heapster,whuwxl/heapster,luxas/heapster,andyxning/heapster