Add test case for undefined first optionalProperty #15
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These test cases address the special case of comma placement when serializing the first optional property. A comma must be placed before every optionalProperty except for the first one. This is an error-prone edge case because the first optionalProperty may not be defined. These tests trigger previously untested behavior for this edge case to prevent issues like ajv-validator/ajv#2181 or ajv-validator/ajv#2171.
Please advise if I can make any adjustments.