optimization - don't register NRS UI related listeners if NRS UI server not enabled
optimization - don't register NRS UI related listeners if NRS UI server not enabled

Ziftr/nxt,metrospark/czarcraft,fimkrypto/nxt,duckx/nxt,duckx/nxt,duckx/nxt,fimkrypto/nxt,fimkrypto/nxt,Ziftr/nxt,Ziftr/nxt,metrospark/czarcraft,fimkrypto/nxt,metrospark/czarcraft