From c9145884606cdc247c394e31c5701aad4e98c00c Mon Sep 17 00:00:00 2001
From: Chris Mackey <chris@ladybug.tools>
Date: Wed, 18 Oct 2023 10:14:34 -0700
Subject: [PATCH] fix(model): Ensure validation of room collisions succeeds for
 no rooms

---
 honeybee/model.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/honeybee/model.py b/honeybee/model.py
index 4f6bc829..8f80e95e 100644
--- a/honeybee/model.py
+++ b/honeybee/model.py
@@ -2174,6 +2174,8 @@ def check_room_volume_collisions(
         tolerance = self.tolerance if tolerance is None else tolerance
         detailed = False if raise_exception else detailed
         # group the rooms by their floor heights to enable collision checking
+        if len(self.rooms) == 0:
+            return [] if detailed else ''
         room_groups, _ = Room.group_by_floor_height(self.rooms, tolerance)
         # loop trough the groups and detect collisions
         msgs = []