message: fix min & max size for empty sublists
diff: @@ -35,14 +35,15 @@ class RoomSubListItem extends ResizeItem {
  }
  maxSize() {
  - const scrollItem = this.domNode.querySelector(".mx_RoomSubList_scroll");
  const header = this.domNode.querySelector(".mx_RoomSubList_labelContainer");
  + const scrollItem = this.domNode.querySelector(".mx_RoomSubList_scroll");
  const headerHeight = this.sizer.getItemSize(header);
  - return headerHeight + scrollItem.scrollHeight;
  + return headerHeight + (scrollItem ? scrollItem.scrollHeight : 0);
  }
  minSize() {
  - return 74; //size of header + 1 room tile
  + const isNotEmpty = this.domNode.classList.contains("mx_RoomSubList_nonEmpty");
  + return isNotEmpty ? 74 : 31; //size of header + 1? room tile (see room sub list css)
  }
  isSized() {
  