Revert "PNE-241: Taking into consideration that material histories endpoint now returns a list of one"

This reverts commit c419c59.

Author: pacdaemon

src/citrine/resources/material_run.py

@@ -140,8 +140,7 @@ def get_history(self, id: Union[str, UUID, LinkByUID, MaterialRun]) -> MaterialR
         }
         data = self.session.post_resource(path, json=query)
 
-        # The query returns a list of material runs, but we only expect one
-        return MaterialRun.build(data[0])
+        return MaterialRun.build(data)
 
     def get_by_process(self,
                        uid: Union[UUID, str, LinkByUID, GEMDProcessRun]

tests/resources/test_material_run.py

@@ -116,8 +116,7 @@ def test_get_history(collection, session):
     cake_json['root'] = next(o for o in cake_json['context'] if root_link.id == o['uids'].get(root_link.scope))
     cake_json['context'].remove(cake_json['root'])
 
-    # The query returns a list of material runs, but we only expect one
-    session.set_response([cake_json])
+    session.set_response(cake_json)
 
     # When
     run = collection.get_history(id=root_link)