placeholder is not displayed

[t-ide]

To help us understand the issue, please fill-in as much of the following information as you can:

What are the steps to reproduce?

1. Make swagger-petstore node using http://petstore.swagger.io/v2/swagger.json
2. Add swagger-petstore node in Node-RED
3. Show property config pane in Node-RED Editor

What happens?

Even if property has placeholder attribute, the placeholder is not displayed on property config pane.

What do you expect to happen?

If property has placeholder attribute, the placeholder is displayed.

Please tell us about your environment:

• Node-RED version: 0.17.5 (nodered/node-red-docker:0.17.5-slim)
• node.js version: v7.8.0
• npm version: 4.2.0
• Platform/OS: Docker on Ubuntu 16.04
• Browser: Firefox 56.0.1 (64-bit)