serializable: Add (nullable) annotation

`json_serializable_serialize_property()` can return NULL, so make that
clear in the documentation (and to GIR).
parent 4188c757
Pipeline #141597 passed with stage
in 2 minutes and 47 seconds
......@@ -199,8 +199,8 @@ G_DEFINE_INTERFACE (JsonSerializable, json_serializable, G_TYPE_OBJECT);
* pspec);
* ]|
* Return value: (transfer full): a #JsonNode containing the serialized
* property
* Return value: (transfer full) (nullable): a #JsonNode containing the
* serialized property, or %NULL if it should be omitted.
* Since: 0.10
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