bugfix metrix

app/Libs/Metrics/MyMetricProvider.php

@@ -179,7 +179,7 @@ class MyMetricProvider implements ProviderInterface
             return ['error' => $error->getMessage()];
         }
         $usage = [];
-        $countOfDomainAliases = count($domain['aliasList']);
+        $countOfDomainAliases = count($domain['aliasList']) ? count($domain['aliasList']) : 0;
         try
         {
             $fields = array(