Fix previous commit 7f87d7c385cb8e4168ac16ce10c82ea3240e4820
Fix previous commit 7f87d7c385cb8e4168ac16ce10c82ea3240e4820

Tag detection and publishing requires a check to ensure at least one tag has been found.

BCLab-UNM/SwarmBaseCode-ROS,BCLab-UNM/SwarmBaseCode-ROS,BCLab-UNM/SwarmBaseCode-ROS,BCLab-UNM/SwarmBaseCode-ROS,BCLab-UNM/SwarmBaseCode-ROS,BCLab-UNM/SwarmBaseCode-ROS