fix: undefined error for xml when example is defined

[AlexVarchuk]

What/Why/How?

fix an undefined error for case when example is exists

{
        type: 'object',
        properties: {
          name: {
            type: 'array',
            items: {
              type: 'string',
              example: ['John', 'Smith'],
            }
          }
        }
      }

Reference

Testing

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