fix(roof): Ensure that RoofSpecification has at least one geometry

dragonfly_schema/roof.py

@@ -1,6 +1,5 @@
 """Geometry for specifying sloped roofs over a Story."""
-from pydantic import Field, constr
-from typing import List
+from pydantic import Field, constr, conlist
 
 from honeybee_schema._base import NoExtraBaseModel
 from honeybee_schema.model import Face3D
@@ -11,7 +10,7 @@ class RoofSpecification(NoExtraBaseModel):
 
     type: constr(regex='^RoofSpecification$') = 'RoofSpecification'
 
-    geometry: List[Face3D] = Field(
+    geometry: conlist(Face3D, min_items=1) = Field(
         ...,
         description='An array of Face3D objects representing the geometry of the '
         'Roof. None of these geometries should overlap in plan and, together, these '