check for None

Author: mikedh

tests/test_3mf.py

@@ -60,7 +60,10 @@ def test_roundtrip(self):
             file_type="3mf",
         )
 
-        assert set(s.geometry.keys()) == set(r.geometry.keys()), (s.geometry.keys(), r.geometry.keys())
+        assert set(s.geometry.keys()) == set(r.geometry.keys()), (
+            s.geometry.keys(),
+            r.geometry.keys(),
+        )
         assert g.np.allclose(s.bounds, r.bounds)
         assert g.np.isclose(s.area, r.area, rtol=1e-3)
 

trimesh/exchange/threemf.py

@@ -112,7 +112,7 @@ def load_3MF(file_obj, postprocess=True, **kwargs):
                     (v.strip("/") for k, v in c.attrib.items() if k.endswith("path")),
                     None,
                 )
-                if path in archive:
+                if path is not None and path in archive:
                     archive[path].seek(0)
                     name = unique_name(
                         obj.attrib.get("name", str(mesh_index)), consumed_names