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e1a34f22d7c16d8c54e95644e054e2aeeefcbc90
The "active ID node" concept has become slightly more complex with pynodes. To find the active material or other ID links in a node tree recursively requires a hash key based on the "parent" tree of the current node group. To avoid returning NULL in case this key is not yet initialized (i.e. ID node has not been activated yet), just accept 0 key as well for the base node tree.
Fix #36939, Objects with nodes appear in gray in viewport, using Solid shade, and the Blender Engine (or Game Engine).
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