message: [sql lab] address lingering spinner in schema select
diff: @@ -32,8 +32,9 @@ class SqlEditorLeftBar extends React.PureComponent {
  this.fetchTables(this.props.queryEditor.dbId, this.props.queryEditor.schema);
  }
  onChange(db) {
  - const val = (db) ? db.value : null;
  + const val = db ? db.value : null;
  this.setState({ schemaOptions: [] });
  + this.props.actions.queryEditorSetSchema(this.props.queryEditor, null);
  this.props.actions.queryEditorSetDb(this.props.queryEditor, val);
  if (!(db)) {
  this.setState({ tableOptions: [] });
  