120c8165fc
The default nodes were still present in the node tree when Setup
Tracking Scene operator was called.
The issue was that the operator assumed the default tree always has the
same number and types of nodes, which wasn't true anymore after the
default node tree was changed in df6e65dd93
This PR keeps the changes to a minimum by updating the assumption
about the default node tree.
Pull Request: https://projects.blender.org/blender/blender/pulls/141141