调整合并部分

api_kucoin.js

@@ -365,7 +365,7 @@ class biboxApi {
     this._request("POST","/v1/orderpending","orderpending/pendingHistoryList",params,callback);
   }
   getOrderbook(symbol,depth,bindIP,callback){
-    this._publicRequest("/v1/open/orders",{"symbol":symbol,"limit":20},callback,bindIP);
+    this._publicRequest("/v1/open/orders",{"symbol":symbol,"limit":25},callback,bindIP);
   }
 }
 

util.js

@@ -20,6 +20,9 @@ const ips = getLocalIpv4s();
 
 
 function mergeDepth(oldDepth, updateDepth, isAsk) {
+  if(!updateDepth.length){
+    return oldDepth;
+  }
   var i = []
     , r = {
     a: 0,