James 80096e9e62 Fix a crash bug in LightmapGI::_assign_lightmaps triggered after reparenting
After reparenting the LightmapGI node, the following `node` would be
initialized to null:

Node *node = get_node(light_data->get_user_path(i));

Which would then crash when de-referenced further down. This fix detects
which the node has been reparented and clears its users.
2025-02-05 12:18:56 +01:00
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