add class exist check

Author: ilyakharev

src/Traits/RequestTrait.php

@@ -186,6 +186,10 @@ protected function handleGrpcStatus($service, $method, $status)
                 'credentials' => $this->ydb->iam()->getCredentials()
             ]);
             if (isset(self::$grpcExceptions[$status->code])) {
+                if (!class_exists(self::$grpcExceptions[$status->code])){
+                    $this->logger->error("Class ".self::$grpcExceptions[$status->code]." not found");
+                    throw new \Exception($message);
+                }
                 throw new self::$grpcExceptions[$status->code]($message);
             } else {
                 throw new \Exception($message);
@@ -255,7 +259,11 @@ protected function processResponse($service, $method, $response, $resultClass)
         );
 
         $msg = 'YDB ' . $service . ' ' . $method . ' (YDB_' . $statusCode . ' ' . $statusName . '): ' . $message;
-        if (isset(self::$ydbExceptions[$statusCode])) {
+        if (isset(self::$ydbExceptions[$statusCode]) && class_exists(self::$ydbExceptions[$statusCode])) {
+                if (!class_exists(self::$ydbExceptions[$status->code])){
+                    $this->logger->error("Class ".self::$ydbExceptions[$status->code]." not found");
+                    throw new \Exception($message);
+                }
             throw new self::$ydbExceptions[$statusCode]($msg);
         } else {
             throw new \Exception($msg);