[apps] AlternateEmptyNestedMenuController handles empty lists

apps/alternate_empty_nested_menu_controller.cpp

@@ -0,0 +1,18 @@
+#include "alternate_empty_nested_menu_controller.h"
+
+void AlternateEmptyNestedMenuController::viewDidDisappear() {
+  if (isDisplayingEmptyController()) {
+    pop();
+  }
+  NestedMenuController::viewDidDisappear();
+}
+
+bool AlternateEmptyNestedMenuController::displayEmptyController() {
+  assert(!isDisplayingEmptyController());
+  // If the content is empty, we push an empty controller.
+  if (numberOfRows() == 0) {
+    push(emptyViewController());
+    return true;
+  }
+  return false;
+}