[ament_cppcheck] Report errors from additional includes #216
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Before, if an error was found in an additional include we get a KeyError exception.
For example: https://ci.ros2.org/job/ci_linux/9443/testReport/junit/(root)/rclcpp_action/cppcheck_xunit_missing_result/
Additional includes added to rclcpp_action and rclcpp_lifecycle in ros2/rclcpp#1000 by chance picked up a cppcheck error in rclcpp, causing a KeyError exception.
The other option is to ignore errors from additional include directories, but I think being louder about errors is better.