message: default null AgentId for collision evaluator
diff: #define MODULES_WORLD_EVALUATION_EVALUATOR_COLLISION_EGO_AGENT_HPP_
  #include <memory>
  +#include <limits>
  #include "modules/world/evaluation/base_evaluator.hpp"
  #include "modules/world/world.hpp"
  @@ -18,6 +19,8 @@ namespace evaluation {
  class EvaluatorCollisionEgoAgent : public BaseEvaluator {
  public:
  + EvaluatorCollisionEgoAgent() :
  + agent_id_(std::numeric_limits<AgentId>()) {}
  explicit EvaluatorCollisionEgoAgent(const AgentId& agent_id) :
  agent_id_(agent_id) {}
  virtual ~EvaluatorCollisionEgoAgent() { }
  