OpenApi2 SwaggerUI execute POST sends empty body

The OpenApi2 SwaggerUI Try Out for POST request appears to be broken, it sends an empty request body. (OpenApi3 works).

This is the resource.json:

```json
{
"operationId" : "birthCertificate",
"summary" : null,
"description" : null,
"privateResource" : false,
"deprecated" : false,
"request" : {
"path" : "/example",
"method" : "POST",
"contentType" : "application/json;charset=UTF-8",
"schema" : null,
"headers" : [ ],
"pathParameters" : [ ],
"requestParameters" : [ ],
"requestFields" : [ ],
"example" : "{\"some\": \"json\"}",
"securityRequirements" : null
},
"response" : {
"status" : 200,
"contentType" : "text/xml",
"schema" : null,
"headers" : [ ],
"responseFields" : [ ],
"example" : "\n"
},
"tags" : [ "sometag" ]
}
```

Below is the resulting openapi2.yml. It has an empty parameter name for the body, and I suspect that this causes the problem, see https://github.com/swagger-api/swagger-ui/issues/965

```yaml
swagger: "2.0"
info:
description: xmaproutes Service
version: 1.0-SNAPSHOT
title: xmaproutes
host: localhost:8090
tags: []
schemes:
- http
paths:
/example:
post:
tags:
- sometag
operationId: birthCertificate
consumes:
- application/json;charset=UTF-8
produces:
- text/xml
parameters:
- in: body
name: "" # I suspect that the empty name might cause the empty body
required: false
schema:
$ref: '#/definitions/myrequest3530607'
x-examples:
application/json;charset=UTF-8: "{"\some\": \"json\"}"
responses:
"200":
description: ""
examples:
text/xml: |-


definitions:
myrequest3530607:
example: "{\"some\": \"json\"}"

```