[escher] Add methods viewWillAppear/Disappear in view controller instead

of keeping track of dataHasChanged in the selectable table view

Change-Id: Id2626f527f44714e29b9bd66e2c843193e1b57b5

apps/node_list_view_controller.cpp

@@ -25,6 +25,7 @@ Node * NodeListViewController::nodeModel() {
 
 void NodeListViewController::setNodeModel(Node * nodeModel) {
   m_nodeModel = nodeModel;
+  m_selectableTableView.reloadData();
 }
 
 void NodeListViewController::setFirstSelectedRow(int firstSelectedRow) {