From 94905acf0536ccad9173d6fd4857a4e9eb2d4a4b Mon Sep 17 00:00:00 2001
From: Bernd Hahnebach <bernd@bimstatik.org>
Date: Mon, 9 Nov 2020 19:29:55 +0100
Subject: [PATCH] Material: fix open material editor with empty material,
 regression was added with commit 66d2688

---
 src/Mod/Material/MaterialEditor.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/Mod/Material/MaterialEditor.py b/src/Mod/Material/MaterialEditor.py
index 019104bcde..77c5c1d317 100644
--- a/src/Mod/Material/MaterialEditor.py
+++ b/src/Mod/Material/MaterialEditor.py
@@ -414,6 +414,8 @@ class MaterialEditor:
         "returns a dictionary from the contents of the editor."
 
         model = self.widget.treeView.model()
+        if model is None:
+            return {}
         root = model.invisibleRootItem()
 
         d = {}