docs: def get_history_item_for_tree_iter(self, child_tree_iter):
          """Hands history item for tree iter and compensate if tree item is a dummy item
  
          :param Gtk.TreeIter child_tree_iter: Tree iter of row
          :rtype rafcon.core.execution.execution_history.HistoryItem:
          :return history tree item:
          """
          history_item = self.history_tree_store[child_tree_iter][self.HISTORY_ITEM_STORAGE_ID]
          if history_item is None:  # is dummy item
              if self.history_tree_store.iter_n_children(child_tree_iter) > 0:
                  child_iter = self.history_tree_store.iter_nth_child(child_tree_iter, 0)
                  history_item = self.history_tree_store[child_iter][self.HISTORY_ITEM_STORAGE_ID]
              else:
                  logger.debug("In a dummy history should be respective real call element.")
          return history_item