Bug report

Required Info:

• Operating System:
  • OSX (i guess applicable to all)
• Installation type:
  • source
• Client library (if applicable):
  • rclcpp

Steps to reproduce issue

ros2 run demo_nodes_cpp talker

ros2 param set talker non-declared-parameter 0.0

Expected behavior

talker nodes ignores undeclared parameter

Actual behavior

talker terminates with uncaught exception