Handle IfcCompositeProfileDef in derive_from_slab

When a slab consists of multiple separate closed loops, the swept area
is IfcCompositeProfileDef which has a Profiles attribute rather than
OuterCurve. Iterate over each profile and generate walls for all loops.

Generated with the assistance of an AI coding tool.

src/bonsai/bonsai/bim/module/model/wall.py

@@ -1398,7 +1398,14 @@ class DumbWallGenerator:
         elevation = self.container_obj.location.z
         representation = ifcopenshell.util.representation.get_representation(slab, "Model", "Body", "MODEL_VIEW")
         extrusion = tool.Model.get_extrusion(representation)
-        outer_curve = extrusion.SweptArea.OuterCurve
+        swept_area = extrusion.SweptArea
+        if swept_area.is_a("IfcCompositeProfileDef"):
+            profiles = swept_area.Profiles
+        else:
+            profiles = [swept_area]
+        walls = []
+        for profile in profiles:
+            outer_curve = profile.OuterCurve
             if self._curve_has_arc_segments(outer_curve):
                 polyline_points = self._derive_points_from_arc_segments(slab_obj, elevation, outer_curve)
             elif outer_curve.is_a("IfcCircle"):
@@ -1410,10 +1417,9 @@ class DumbWallGenerator:
                 polyline_points = [slab_obj.matrix_world @ Vector((p[0], p[1], elevation)) for p in polyline_points]
 
             if len(polyline_points) < 3:
-            return []
+                continue
             if not tool.Cad.is_counter_clockwise_order(polyline_points[0], polyline_points[1], polyline_points[2]):
                 polyline_points = polyline_points[::-1]
-        walls = []
             for i in range(len(polyline_points) - 1):
                 vec1 = polyline_points[i]
                 vec2 = polyline_points[i + 1]