bitpanda minor edits

Author: kroitor

js/bitpanda.js

@@ -577,7 +577,7 @@ module.exports = class bitpanda extends Exchange {
 
     async fetchTickers (symbols = undefined, params = {}) {
         await this.loadMarkets ();
-        const tickers = await this.publicGetMarketTicker (params);
+        const response = await this.publicGetMarketTicker (params);
         //
         //     [
         //         {
@@ -599,12 +599,12 @@ module.exports = class bitpanda extends Exchange {
         //     ]
         //
         const result = {};
-        for (let i = 0; i < tickers.length; i++) {
-            const ticker = this.parseTicker (tickers[i]);
+        for (let i = 0; i < response.length; i++) {
+            const ticker = this.parseTicker (response[i]);
             const symbol = ticker['symbol'];
             result[symbol] = ticker;
         }
-        return result;
+        return this.filterByArray (result, 'symbol', symbols);
     }
 
     async fetchOrderBook (symbol, limit = undefined, params = {}) {