test(evaluators): IsEmpty and IsNotEmpty on 0, False and whitespace #407

Problem

IsEmpty treats only None, "", [] and {} as empty, so 0 and False count as "not empty". That behavior is intended, but no test pins it, and " " (whitespace) is untested too.

What to change

Add 0, False, " " and {"a": None} to the parametrized cases in tests/core/evaluators/test_is_empty.py and test_is_not_empty.py.

Done when

Both files include those inputs with the expected verdicts.

Comment to claim this issue and wait to be assigned. Unclaimed or inactive for 3 days, it returns to the pool. Run pytest tests/ and black --line-length 120 before opening the PR.