Default absent coordinates to 0 in retoken --check

Andrew Dunnrequested to merge
design/retoken-circle-cx into main

What does this MR do and why?

I want retoken.py --check to read a missing coordinate the way SVG does, as 0. The grid check already tested the defaulted value, then indexed the attribute map by name to write its message, so a <circle> with cy and no cx raised KeyError: 'cx' once a group's translate put it off the 4px grid. The message now uses the same defaulted value and reads cx (absent, so 0). A CHANGELOG Fixed entry records it.

References

None.

Standards affected

None.

Exemption implications

None.

Test plan

  • just guard, just validate, just check REPO=$PWD, just build and just agent pass.
  • retoken.py --check over the 9 files in design/diagrams/templates/ reports each clean, as on main.
  • Before, on main's script: a plate with a circle (cy only) and a rect (y, no x) inside <g transform="translate(2 0)"> exits 1 with KeyError: 'cx'.
  • After, the same plate exits 1 with two findings and no traceback: grid: cx (absent, so 0) on <circle> at line 5 and grid: x (absent, so 0) on <rect> at line 5.
  • After, the same shapes with no group, and inside translate(4 0), exit 0 and report clean, as before.
  • Not tested: a <text> or <ellipse> with a missing coordinate. The grid check reads only rect, line, circle and ellipse, and ellipse shares the circle's code path.
  • Known limit: the kit has no fixtures or test runner, so the scratch plates are not committed.

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