calling hasVertex on a graph with more then one vertex is failing

[FLasH3r]

My Environment

Latest version (3.6.0), PHP 7.3

Component, Query & Data

Affected feature:
Unable to use HasHandler on a graph with more then one vertex.
error: ArangoDBClient\\ClientException: A collection must be provided.

Steps to reproduce

1. create a graph with more than one vertex
2. call hasVertex on any vertex, get the error

Problem:
when calling GraphHandler method HasHandler, the signature is as described in the code:

     /**
     * Check if a vertex exists
     *
     * This will call self::getVertex() internally and checks if there
     * was an exception thrown which represents an 404 request.
     *
     * @throws Exception When any other error than a 404 occurs
     *
     * @param mixed $graph    - graph name as a string or instance of Graph
     * @param mixed $vertexId - the vertex identifier
     *
     * @return boolean
     */
    public function hasVertex($graph, $vertexId)
    {
        try {
            // will throw ServerException if entry could not be retrieved
            $this->getVertex($graph, $vertexId);

            return true;
        } catch (ServerException $e) {
            // we are expecting a 404 to return boolean false
            if ($e->getCode() === 404) {
                return false;
            }

            // just rethrow
            throw $e;
        }
    }

My graph has more then one vertex as described in the doc block of getVertex, so I need to pass the $collection parameter, but it does not exists in the hasVertex method

     /**
     * Get a single vertex from a graph
     *
     * This will throw if the vertex cannot be fetched from the server<br><br>
     *
     * @throws Exception
     *
     * @param mixed  $graph      - graph name as a string or instance of Graph
     * @param mixed  $vertexId   - the vertex identifier
     * @param array  $options    optional, an array of options:
     *                           <p>
     *                           <li><b>_includeInternals</b> - true to include the internal attributes. Defaults to false</li>
     *                           <li><b>_ignoreHiddenAttributes</b> - true to show hidden attributes. Defaults to false</li>
     *                           </p>
     * @param string $collection - if one uses a graph with more than one vertex collection one must provide the collection
     *                           to load the vertex.
     *
     * @return Document
     * @since 1.2
     */
    public function getVertex($graph, $vertexId, array $options = [], $collection = null)

Expected result:
hasVertex should work on a graph setup with more then one vertex