Nuke: callback at start not setting colorspace

[create-issue-branch]

closes #1412

[hound]

Some files could not be reviewed due to errors:

Traceback (most recent call last):

Traceback (most recent call last):
  File "/usr/local/bin/flake8", line 8, in 
    sys.exit(main())
  File "/usr/local/lib/python3.8/dist-packages/flake8/main/cli.py", line 18, in main
    app.run(argv)
  File "/usr/local/lib/python3.8/dist-packages/flake8/main/application.py", line 393, in run
    self._run(argv)
  File "/usr/local/lib/python3.8/dist-packages/flake8/main/application.py", line 381, in _run
    self.run_checks()
  File "/usr/local/lib/python3.8/dist-packages/flake8/main/application.py", line 300, in run_checks
    self.file_checker_manager.run()
  File "/usr/local/lib/python3.8/dist-packages/flake8/checker.py", line 331, in run
    self.run_serial()
  File "/usr/local/lib/python3.8/dist-packages/flake8/checker.py", line 315, in run_serial
    checker.run_checks()
  File "/usr/local/lib/python3.8/dist-packages/flake8/checker.py", line 598, in run_checks
    self.run_ast_checks()
  File "/usr/local/lib/python3.8/dist-packages/flake8/checker.py", line 502, in run_ast_checks
    for (line_number, offset, text, check) in runner:
  File "/usr/local/lib/python3.8/dist-packages/flake8_django/checker.py", line 56, in run
    parser.visit(self.tree)
  File "/usr/lib/python3.8/ast.py", line 363, in visit
    return visitor(node)
  File "/usr/lib/python3.8/ast.py", line 371, in generic_visit
    self.visit(item)
  File "/usr/local/lib/python3.8/dist-packages/flake8_django/checker.py", line 39, in visit_ClassDef
    self.capture_issues_visitor('ClassDef', node)
  File "/usr/local/lib/python3.8/dist-packages/flake8_django/checker.py", line 33, in capture_issues_visitor
    self.generic_visit(node)
  File "/usr/lib/python3.8/ast.py", line 373, in generic_visit
    self.visit(value)
  File "/usr/local/lib/python3.8/dist-packages/flake8_django/checker.py", line 36, in visit_Call
    self.capture_issues_visitor('Call', node)
  File "/usr/local/lib/python3.8/dist-packages/flake8_django/checker.py", line 30, in capture_issues_visitor
    issues = checker.run(node)
  File "/usr/local/lib/python3.8/dist-packages/flake8_django/checkers/render.py", line 22, in run
    if isinstance(arg, ast.Call) and arg.func.id == 'locals':
AttributeError: 'Attribute' object has no attribute 'id'