Make metadata.usage not required

funkwhale_network/schemas.py

@@ -113,7 +113,7 @@ class MetadataSchema(marshmallow.Schema):
     nodeName = marshmallow.fields.String(required=True)
     private = marshmallow.fields.Boolean(required=True)
     library = marshmallow.fields.Nested(LibraryMetadataSchema, required=True)
-    usage = marshmallow.fields.Nested(MetadataUsageSchema, required=True)
+    usage = marshmallow.fields.Nested(MetadataUsageSchema, required=False)
 
     class Meta:
         unknown = marshmallow.EXCLUDE