PLE1141 fix is suppressed for empty `dict`

[dscorbett]

Summary

The fix for dict-iter-missing-items (PLE1141) is suppressed when the relevant dict’s keys are all 2-tuples in its initial binding. This usually makes sense, but it doesn’t make sense when the dict is defined as empty. In that case, there is no reason to assume that any keys added later will be 2-tuples, and that is a rare pattern so they probably won’t be, so PLE1141 should allow the fix. If the empty dict is annotated to have 2-tuple keys, as in dict[tuple[int, str], bool], though, it is still appropriate to suppress the fix. Example:

$ cat >ple1141.py <<'# EOF'
data = {}
data["x"] = 1
for k, v in data:
    print(f"{k=} {v=}")
# EOF

$ ruff --isolated check ple1141.py --select PLE1141 --preview
All checks passed!

Version

ruff 0.14.3 (8737a2d 2025-10-30)

[ntBre]

I think it makes sense to try being a bit more aggressive here, especially since the rule is in preview. We should just double check the ecosystem report to make sure there aren't too many new false positives.