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Support empty response from swh-graph

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Description

Support empty response from swh-graph

Workaround to support the empty response of swh-graph when a
revision has no parent

In this case, swh-graph should reply a 201 no-content
and this response should be correctly interpreted by the swh-graph
lib, but it the meantime, it'll allow provenance to work with
swh-graph

Related to T4314

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