Thanks for your first contribution @opavlov24! Could you also add a couple elements to the [volume_type_list_simple.json](https://github.com/jclouds/jclouds/blob/master/apis/openstack-cinder/src/test/resources/volume_type_list_simple.json) object, one with an empty `extra_specs` and another with a `null` one? This file is used in the [VolumeTypeApiExpectTest](https://github.com/jclouds/jclouds/blob/master/apis/openstack-cinder/src/test/java/org/jclouds/openstack/cinder/v1/features/VolumeTypeApiExpectTest.java#L41-L52) to verify the api method behaves as expected and generates the expected request and can deserialize the response. That test will tell us the patch actually works and also make sure we won't break that accidentally in the future.
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