Report a non-zero exit code if a test file has no tests

[jviotti]

Signed-off-by: Juan Cruz Viotti jv@jviotti.com

[augmentcode]

🤖 Augment PR Summary

Summary: This PR makes the jsonschema test command fail with a non-zero exit status when a test file contains an empty tests array, preventing “no-op” test suites from silently passing.

Changes:

• Track whether any suite has total == 0 in both text and CTRF reporters.
• After printing results, throw Fail{EXIT_OTHER_INPUT_ERROR} when an empty suite is detected (exit code 6).
• Update documentation to note empty tests arrays now lead to non-zero exit.
• Replace/rename existing “empty tests” fixtures to expect failure, and add a new test covering both text output and --json CTRF output.
• Adjust an existing config-path test to include a real test case so it continues to pass under the new semantics.

Technical Notes: Behavior is consistent across --verbose and --json modes; output is still emitted, but the process exits non-zero when any suite has zero tests.

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[augmentcode]

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