Bugfix

[carlosascari]

When using the conditionalHandler plugin, if a single version route has a contentType, but the other routes do not, it will crash as it tries to call .join on a undefined contentType field.

See for yourself:

const restify = require('restify');

const server = restify.createServer();

server.get('/', restify.plugins.conditionalHandler([
  {
    contentType: ['application/json'],
    version: '1.5.0', 
    handler: (req, res, next) => {
      res.json({
        version: 0
      })
    }
  },
  {
    // contentType is missing here
    version: '1.1.0', 
    handler: (req, res, next) => {
      res.json({
        version: 1
      })
    }
  }
]));

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