filter out non-polygons with assert_multipolygon

src/c3nav/mapdata/utils/geometry.py

@@ -29,7 +29,7 @@ def assert_multipolygon(geometry):
         return []
     if isinstance(geometry, Polygon):
         return [geometry]
-    return geometry.geoms
+    return [geom for geom in geometry.geoms if isinstance(geom, Polygon)]
 
 
 def assert_multilinestring(geometry):

src/c3nav/routing/room.py

@@ -133,6 +133,7 @@ class GraphRoom():
                 points += self._add_ring(interior, want_left=True)
 
         # points around steps
+        print(self._built_isolated_areas)
         self.add_points_on_rings(self._built_isolated_areas)
 
     def _add_ring(self, geom, want_left):