message: [bugfix] css editor dooesn't pop up
diff: @@ -94,7 +94,7 @@ class CssEditor extends React.PureComponent {
  width="100%"
  editorProps={{ $blockScrolling: true }}
  enableLiveAutocompletion
  - value={this.state.css}
  + value={this.state.css || ''}
  />
  </div>
  </div>
  