[Bf-blender-cvs] [a0780ad6253] master: Fix: Exception in tree view code in new case

[Hans Goudey]

Commit: a0780ad6253fcb9768dd3184351998effef6d178
Author: Hans Goudey
Date:   Fri Nov 19 17:28:08 2021 -0500
Branches: master
https://developer.blender.org/rBa0780ad6253fcb9768dd3184351998effef6d178

Fix: Exception in tree view code in new case

This isn't a problem in 3.0 or master, but I'm porting the spreadsheet
data set region to a tree view and ran into this. This line needs to
whether the function is empty before calling it.

Differential Revision: https://developer.blender.org/D13197

===================================================================

M	source/blender/editors/interface/tree_view.cc

===================================================================

diff --git a/source/blender/editors/interface/tree_view.cc b/source/blender/editors/interface/tree_view.cc
index fcc878c440c..fabb2c2187a 100644
--- a/source/blender/editors/interface/tree_view.cc
+++ b/source/blender/editors/interface/tree_view.cc
@@ -546,7 +546,7 @@ uiButTreeRow *AbstractTreeViewItem::tree_row_button()
 
 void AbstractTreeViewItem::change_state_delayed()
 {
-  if (is_active_fn_()) {
+  if (is_active_fn_ && is_active_fn_()) {
     activate();
   }
 }