Example values are populated into requests when property is empty string

[tgandrews]

Here is an example app:

var express = require('express');
var swagger = require('swagger-express-middleware');
var request = require('request');

var app = express();

swagger({
  swagger: '2.0',
  info: {
    version: '1.0',
    title: 'Bug'
  },
  consumes: [
    'application/json'
  ],
  paths: {
    '/': {
      post: {
        parameters: [{
          name: 'payload',
          in: 'body',
          required: true,
          schema: {
            $ref: '#/definitions/Node'
          }
        }]
      }
    }
  },
  definitions: {
    Node: {
      type: 'object',
      properties: {
        name: {
          type: 'string',
          example: 'should not see'
        },
      }
    }
  }
}, app, function(err, middleware) {

  app.use(
    middleware.metadata(),
    middleware.parseRequest(),
    middleware.validateRequest(),
    function (req, res, next) {
      res.status(200).json(req.body).end();
    }
  );

  app.listen(8000, function() {
    request({
      url: 'http://localhost:8000',
      method: 'POST',
      body: { name: '' },
      json: true,
    }, function(err, res, body) {
      console.log(body);
    });
  });
});

This logs

{ name: 'should not see' }

When it should log the value posted:

{ name: '' }

This example value is coming from getValueToValidate in lib/helpers/json-schema.js. Where if you pass an empty string then it returns the example data and updates the value.

This makes perfect sense for default value but not example value.