Merge branch 'feature/ws_ticker' into 'master'

api/controllers/TickerController.php

@@ -142,7 +142,7 @@ class TickerController extends BaseController
 
                 $exchange = ExchangeFactory::createExchange($exchange);
                 $quotation = $exchange->getTicker(strtolower($tag_first), strtolower($tag_second));
-
+                if(empty($quotation)) continue;
                 $temp['symbol'] = $val['symbol'];
                 $temp['currency'] = strtoupper($tag_first);
                 $temp['base_currency'] = strtoupper($tag_second);