message: Remove unnecessary check for empty list
  The std::find and subsequent if will already quickly handle any empty
  lists in the correct way.
diff: @@ -112,10 +112,7 @@ void ListBox::addItem(const std::string& item, int tag)
  */
  void ListBox::removeItem(const std::string& item)
  {
  - if (isEmpty()) { return; }
  -
  auto it = std::find(mItems.begin(), mItems.end(), item);
  -
  if (it != mItems.end())
  {
  mItems.erase(it);
  