chore(filler): always delete output directory with no tests (without specifying `--no-html`)#4

danceratopz wants to merge 3 commits intofelix314159:fixtures-dir-nuked-when-nothing-was-filled-and-html-disabledfelix314159/execution-spec-tests:fixtures-dir-nuked-when-nothing-was-filled-and-html-disabledfrom

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