Added update discover property and check on empty discovery list

Author: Илья

src/Traits/RequestTrait.php

@@ -179,7 +179,7 @@ protected function handleGrpcStatus($service, $method, $status)
                 }catch (\Exception $e){}
             }
             $endpoint = $this->ydb->endpoint();
-            if ($this->ydb->needDiscovery()){
+            if ($this->ydb->needDiscovery() && count($this->ydb->cluster()->all()) > 0){
                 $endpoint = $this->ydb->cluster()->all()[array_rand($this->ydb->cluster()->all())]->endpoint();
             }
             $this->client = new $this->client($endpoint,[

src/Ydb.php

@@ -114,6 +114,7 @@ public function __construct($config = [], LoggerInterface $logger = null)
 
         if (!empty($config['discovery']))
         {
+            $this->discover = true;
             if (isset($config['discoveryInterval'])){
                 $this->discoveryInterval = $config['discoveryInterval'];
             }