message: null-guard savedState since now we're accessing its props
diff: @@ -298,8 +298,8 @@ export default class MessageComposerInput extends React.Component {
  // the currently displayed editor state (note: this is always what is modified on input)
  editorState: this.createEditorState(
  isRichTextEnabled,
  - savedState.editor_state,
  - savedState.rich_text,
  + savedState ? savedState.editor_state : undefined,
  + savedState ? savedState.rich_text : undefined,
  ),
  // the original editor state, before we started tabbing through completions
  