Revert "Fix segfault in test_planner_random_node/test_planner_costmap…

…s_node (#1640)"

This reverts commit 26d776b.

nav2_system_tests/src/planning/planner_tester.hpp

@@ -83,12 +83,6 @@ class NavFnPlannerTester : public nav2_planner::PlannerServer
     }
     try {
       path = planners_["GridBased"]->createPlan(start, goal);
-      // The situation when createPlan() did not throw any exception
-      // does not guarantee that plan was created correctly.
-      // So it should be checked additionally that path is correct.
-      if (!path.poses.size()) {
-        return false;
-      }
     } catch (...) {
       return false;
     }