[backport dashing] fix building test when ROS 1 diagnostic_msgs is isolated from roscpp#237

Merged

dirk-thomas merged 1 commit intodashingfrom dirk-thomas/backport-dashing-236

Jan 15, 2020

+2-2

Commits on Jan 15, 2020

fix building test when ROS 1 diagnostic_msgs is isolated from roscpp (#236 )
dirk-thomas
committed