swagger_2 -> openapi_3: Crash when body parameter is missing schema

[icholy]

Trying to convert the following file will make the converter crash:

{
	"swagger": "2.0",
	"paths": {
		"/endpoint": {
			"post": {
				"parameters": [
					{
						"in": "body",
						"name": "body"
					}
				]
			}
		}
	},
}

Command:

api-spec-converter -f swagger_2 -t openapi_3 swagger.json

Error:

Fatal SyntaxError: Unexpected token u in JSON at position 0
    at JSON.parse (<anonymous>)
    at Object.clone (/home/icholy/.nvm/versions/node/v16.20.1/lib/node_modules/api-spec-converter/node_modules/swagger2openapi/common.js:12:17)
    at processParameter (/home/icholy/.nvm/versions/node/v16.20.1/lib/node_modules/api-spec-converter/node_modules/swagger2openapi/index.js:490:54)
    at processPaths (/home/icholy/.nvm/versions/node/v16.20.1/lib/node_modules/api-spec-converter/node_modules/swagger2openapi/index.js:678:25)
    at main (/home/icholy/.nvm/versions/node/v16.20.1/lib/node_modules/api-spec-converter/node_modules/swagger2openapi/index.js:845:5)
    at /home/icholy/.nvm/versions/node/v16.20.1/lib/node_modules/api-spec-converter/node_modules/swagger2openapi/index.js:1133:13
    at Generator.next (<anonymous>)
    at onFulfilled (/home/icholy/.nvm/versions/node/v16.20.1/lib/node_modules/api-spec-converter/node_modules/co/index.js:65:19)