[Bf-extensions-cvs] [52adb675] master: Fix T102583: Node Wrangler: Fails to set viewer when nodegroup node in tree is missing datablock

[Simon Thommes]

Commit: 52adb675171b2ddf1a4a0a957d2d8ee818f6151e
Author: Simon Thommes
Date:   Thu Nov 17 13:58:55 2022 +0100
Branches: master
https://developer.blender.org/rBA52adb675171b2ddf1a4a0a957d2d8ee818f6151e

Fix T102583: Node Wrangler: Fails to set viewer when nodegroup node in tree is missing datablock

Added nullcheck to make sure execution is possible.

Differential Revision: https://developer.blender.org/D16534

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M	node_wrangler.py

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diff --git a/node_wrangler.py b/node_wrangler.py
index 5932388f..3b9378ee 100644
--- a/node_wrangler.py
+++ b/node_wrangler.py
@@ -1397,6 +1397,8 @@ class NWPreviewNode(Operator, NWBase):
         # get all viewer sockets in a material tree
         for node in tree.nodes:
             if hasattr(node, "node_tree"):
+                if node.node_tree is None:
+                    continue
                 for socket in node.node_tree.outputs:
                     if is_viewer_socket(socket) and (socket not in sockets):
                         sockets.append(socket)