Bug in bt ports of type float

[SteveMacenski]

Moving ticket from Nav2 on BT.CPP: ros-navigation/navigation2#2148

When changing a custom node, the ports aren't working properly it appears from @KvE-sax report:

<TemplateCondition port_test_value="0.60"/>

BT::NodeStatus TemplateCondition::tick()
{
  std::lock_guard<std::mutex> lock(mutex_);

  float port_test_value;
  getInput("port_test_value", port_test_value);
  RCLCPP_INFO(node_->get_logger(), 
    "[Template Condition][tick] port_test_value: %f ", port_test_value);
}
  }

static BT::PortsList providedPorts()
  {
    return { 
      BT::InputPort<float>("port_test_value", 1, "Discription of value"),
    };
  }

[facontidavide]

Fixed. The weird thing is that it should throw, as shown here:

https://github.com/BehaviorTree/BehaviorTree.CPP/blob/master/include/behaviortree_cpp_v3/basic_types.h#L68

[SteveMacenski]

Thanks!