Update test-all-your-base.bats

[Vincent-de-Comarmond]

0 should not be converted to the empty string when converting between bases. 0 should remain 0.

[github-actions[bot]]

This PR touches files which potentially affect the outcome of the tests of an exercise. This will cause all students' solutions to affected exercises to be re-tested.

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[glennj]

@IsaacG do you remember why the output is empty when the input digits are all zeroes? This is from #63

[glennj]

@Vincent-de-Comarmond it's not enough to alter the tests: you have to make sure the example solution passes:

• run bin/validate_one_exercise exercises/practice/all-your-base
• edit exercises/practice/all-your-base/.meta/example.awk
• repeat until the tests pass.

[Vincent-de-Comarmond]

@glennj - Updated example solution as asked

[IsaacG]

@IsaacG do you remember why the output is empty when the input digits are all zeroes? This is from #63

No. Probably an oversight. Though I would have expected the tests to be auto generated from the spec.

[glennj]

Thanks for working to fix this!