improved miner name requests

lib/node.js

@@ -321,6 +321,11 @@ Node.prototype.getMinerName = function(miner)
 			this._knownMiners.push({miner: miner, name: name});
 			return name;
 		}
+		else
+		{
+			this._knownMiners.push({miner: miner, name: false});
+			return false;
+		}
 	}
 
 	return false;