message: fix(Overlay): DOM warning when wrapper haven't mounted yet
  Closes
diff: @@ -6,7 +6,7 @@ import as from "../../enhancers/as";
  import Hidden from "../Hidden";
  class Component extends React.Component {
  - state = {};
  + state = { wrapper: null };
  componentDidMount() {
  const wrapper = document.createElement("div");
  @@ -15,8 +15,10 @@ class Component extends React.Component {
  }
  componentWillUnmount() {
  + if (this.state.wrapper) {
  document.body.removeChild(this.state.wrapper);
  }
  + }
  render() {
  const { wrapper } = this.state;
  