Suppress warning when packages aren't available (#355)
Suppress warning when packages aren't available (#355)

* Suppress warning when packages aren't available

ROS1 packages aren't available on all platforms.  In order to keep
ros1_bridge in ros2.repos without warnings turning CI yellow, we need to
suppress this warning.

Signed-off-by: Michael Carroll <17b9e1c64588c7fa6419b4d29dc1f4426279ba01@openrobotics.org>
ros2/ros1_bridge,ros2/ros1_bridge