If I delete one folder from my install directory and source the high level prefix.bash, the script throws: bash: cd: ../new_connext_ws/install_debug_isolated/ros1_bridge: No such file or directory.

As it stands it's unclear from the user perspective that everything else has been source properly or if the script stopped. Checking for existence before calling it and priting an error message saying notifying users that a given package has been skipped would be clearer.

Maybe this has not been done for performance purposes ?