message: Don't show aside in panel header if it isn't exists
diff: @@ -99,9 +99,19 @@ export default class View extends Component {
  })}
  key={panel.key || panel.props.id || `panel-header-${i}`}
  >
  - <div className="View__header-left">{panel.props.header.left}</div>
  - <div className="View__header-title">{panel.props.header.title}</div>
  - <div className="View__header-right">{panel.props.header.right}</div>
  + {panel.props.header.left && (
  + <div className="View__header-left">
  + {panel.props.header.left}
  + </div>
  + )}
  + <div className="View__header-title">
  + {panel.props.header.title}
  + </div>
  + {panel.props.header.right && (
  + <div className="View__header-right">
  + {panel.props.header.right}
  + </div>
  + )}
  </div>
  ))}
  </div>
  