fix: check that last_non_whitespace_character is not an empty string #105
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Fixes the problem where JSON Schema could end up with leading commas. The problem was that
last_non_whitespace_character
is set to an empty string if there has not been a non whitespace character, but the check that increments num_items didn't handle that case.Dealign with the empty string is a bit unsatisfying, but I didn't feel comfortable with all of the implications of refactoring it other than to add the check.
Resolves #99