Handle empty body about open-api

[sivakar12]

'apollo-server-core' is throwing the error but out 'apollo-server-lambda' hander is catching the error and adding the error message
https://github.com/apollographql/apollo-server/blob/master/packages/apollo-server-lambda/src/lambdaApollo.ts

try {
      gqlResponse = await runHttpQuery([event, lambdaContext], {
        method: event.httpMethod,
        options: options,
        query: query,
      });
      headers['Content-Type'] = 'application/json';
      statusCode = 200;
    } catch (error) {
      if ('HttpQueryError' !== error.name) {
        throw error;
      }

      headers = error.headers;
      statusCode = error.statusCode;
      gqlResponse = error.message;
}