Error thrown when resolving null for a nullable object type

[alexstrat]

When a field is an object type that is not non-nullable, resolving it to null throws an error, while it's expected to just resolve null.

const typeDefs = `
  type Query {
    foo: Foo
  }
  type Foo {
    bar: Int
  }
`;

const resolvers = {
  Query: {
    foo: () => {
      return null;
    }
  }
};


const query = gql`
  query {
    foo {
      bar
    }
  }
`;

// reactive-graphql
$graphql(schema, query)
// -> error reactive-graphql: resolver emitted empty value 

// reference graphql-js
execute(schema, query)
// -> {"data":{"foo":null}} 

https://codesandbox.io/s/4qvw8y31yw

[mesosphere-frontend-ci]

🎉 This issue has been resolved in version 3.0.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀