Fixed empty response from v2 meter event stream endpoint

[prathmesh-stripe]

MeterEventStream returns a void response. As part of request handling we setLastResponse on the returned object from \Stripe\Util\Util::convertToStripeObject. Empty response meant we were getting back an array.

Fix

If the returned object is an array, we create a new empty StripeObject and set the response on it.

Another option would've been to skip setting the response itself. Open to hearing your opinions based on how this is handled in other languages.

Sample code that caused this issue.

$meterClient = new \Stripe\StripeClient([
        'api_key' => $meterEventSession->authentication_token,
    ]);

    $meterEvent = [
        'event_name' => 'new_meter',
        'payload'    => [
            'stripe_customer_id' => 'cus_Qv....,
            'value'              => '25',
        ],
    ];
    $createMeterEventResponse = $meterClient->v2->billing->meterEventStream->create([
            'events' => [$meterEvent],
        ]
    );
    print_r($createMeterEventResponse);