Path parameters with no name cause an exception in console

[hkosova]

Q&A (please complete the following information)

• OS: Windows 10
• Browser: Chrome latest
• Method of installation: https://editor.swagger.io
• Swagger-Editor version: 3.9.0
• Swagger/OpenAPI version: 2.0, 3.0

Content & configuration

swagger: '2.0'
info:
  title: Parameter name case test
  version: 0.0.0
paths:
  /foo/{id}:
    get:
      parameters:
        - in: path
          type: integer
          required: true
      responses:
        200:
          description: OK

Describe the bug you're encountering

During semantic validation, this line
https://github.com/ralphdoe/swagger-editor/blob/master/src/plugins/validate-semantic/validators/helpers.js#L42
tries to convert the parameter name to lower case. But if the parameter has no name, then toLowerCase() will raise an exception.

PR: #2162

To reproduce...

1. Go to https://editor.swagger.io.
2. Open the browser console.
3. Replace the default definition with the one provided above.
4. Wait 1 minute.

Expected behavior

No exceptions in console.

Actual behavior

Uncaught (in promise) TypeError: Cannot read property 'toLowerCase' of undefined
    at helpers.js:42
    at Array.find (<anonymous>)
    at helpers.js:42
    at Array.forEach (<anonymous>)
    at tn (helpers.js:37)
    at paths.js:37
    at u (runtime.js:45)
    at Generator._invoke (runtime.js:271)
    at Generator.forEach.e.<computed> [as next] (runtime.js:97)
    at i (asyncToGenerator.js:5)

Screenshots

Additional context or thoughts

n/a