Description

Running the collisions_updater results in a runtime error if no package path is used and if the URDF/SRDF pair is provided as absolute paths.

This bug was probably introduced with #2032, which added the runtime error in case the package path is empty: https://github.com/ros-planning/moveit2/blob/main/moveit_setup_assistant/moveit_setup_framework/src/urdf_config.cpp#L136