Array items with oneOf schemas are rendered as null in examples

[hkosova]

Q	A
Bug or feature request?	Bug
Which Swagger/OpenAPI version?	3.0
Which Swagger-UI version?	3.4.2
How did you install Swagger-UI?	http://editor.swagger.io
Which browser & version?	Chrome 62
Which operating system?	Windows 7

Demonstration API definition

openapi: 3.0.0
info:
  version: 0.0.0
  title: test

paths:
  /:
    get:
      responses:
        '200':
          description: An array containing strings and/or integers
          content:
            application/json:
              schema:
                type: array
                items:
                  oneOf:
                    - type: string
                    - type: integer

Expected Behavior

The rendered array example should use the appropriate item type - in this example, string and/or integer, that is, something like

[
  "string"
]

or

[
  0
]

or maybe even

[
  "string",
  0
]

Current Behavior

The response example is displayed as

[
  null
]

which is wrong - because the array item schema is not nullable.

Context

This might be related to #3803.

Workaround

Add an example to the schema:

              schema:
                type: array
                items:
                  oneOf:
                    - type: string
                    - type: integer
                  example: apples
                # OR
                example:
                  - oranges
                  - 15

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