message: only show continues link if tombstone has a continuation
diff: @@ -362,18 +362,22 @@ export default class MessageComposer extends React.Component {
  } else if (this.state.tombstone) {
  const replacementRoomId = this.state.tombstone.getContent()['replacement_room'];
  - controls.push(<div className="mx_MessageComposer_replaced_wrapper">
  - <div className="mx_MessageComposer_replaced_valign">
  - <img className="mx_MessageComposer_roomReplaced_icon" src={require("../../../../res/img/room_replaced.svg")} />
  - <span className="mx_MessageComposer_roomReplaced_header">
  - {_t("This room has been replaced and is no longer active.")}
  - </span><br />
  + const continuesLink = replacementRoomId ? (
  <a href={makeRoomPermalink(replacementRoomId)}
  className="mx_MessageComposer_roomReplaced_link"
  onClick={this._onTombstoneClick}
  >
  {_t("The conversation continues here.")}
  </a>
  + ) : '';
  +
  + controls.push(<div className="mx_MessageComposer_replaced_wrapper">
  + <div className="mx_MessageComposer_replaced_valign">
  + <img className="mx_MessageComposer_roomReplaced_icon" src={require("../../../../res/img/room_replaced.svg")} />
  + <span className="mx_MessageComposer_roomReplaced_header">
  + {_t("This room has been replaced and is no longer active.")}
  + </span><br />
  + { continuesLink }
  </div>
  </div>);
  } else {
  