From 50cbdb7694f8a66260d85656f298ca81c2117085 Mon Sep 17 00:00:00 2001
From: Ales Erjavec <ales.erjavec@fri.uni-lj.si>
Date: Mon, 14 Sep 2020 16:53:50 +0200
Subject: [PATCH] canvasmain: Fix typing error in render_error_details

---
 orangecanvas/application/canvasmain.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/orangecanvas/application/canvasmain.py b/orangecanvas/application/canvasmain.py
index 1dd1fbe12..3c6b05229 100644
--- a/orangecanvas/application/canvasmain.py
+++ b/orangecanvas/application/canvasmain.py
@@ -2737,7 +2737,7 @@ def collectall(
                                      IncompatibleChannelTypeError))
     )
     contents = []
-    if missing_node_defs is not None:
+    if missing_node_defs:
         contents.extend([
             "Missing node definitions:",
             *["  \N{BULLET} " + e.args[0] for e in missing_node_defs],