From ce2911cc3320dffe04f0b6ad44e0280119ccd607 Mon Sep 17 00:00:00 2001
From: CarolinePascal <caroline8.pascal@gmail.com>
Date: Thu, 15 Jun 2023 16:48:39 +0200
Subject: [PATCH] Adding save case where no meshes were ever loaded

---
 urchin/urdf.py | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/urchin/urdf.py b/urchin/urdf.py
index db15834..f509549 100644
--- a/urchin/urdf.py
+++ b/urchin/urdf.py
@@ -710,12 +710,13 @@ def _to_xml(self, parent, path):
         fn = get_filename(path, self.filename, makedirs=True)
 
         # Export the meshes as a single file
-        meshes = self.meshes
-        if len(meshes) == 1:
-            meshes = meshes[0]
-        elif os.path.splitext(fn)[1] == ".glb":
-            meshes = trimesh.scene.Scene(geometry=meshes)
-        trimesh.exchange.export.export_mesh(meshes, fn)
+        if self._meshes is not None:
+            meshes = self.meshes
+            if len(meshes) == 1:
+                meshes = meshes[0]
+            elif os.path.splitext(fn)[1] == ".glb":
+                meshes = trimesh.scene.Scene(geometry=meshes)
+            trimesh.exchange.export.export_mesh(meshes, fn)
 
         # Unparse the node
         node = self._unparse(path)