Fix containerlab CI cleanup when no containers are running. (#167)

test/ci-cleanup.sh

@@ -4,11 +4,15 @@ set -e
 echo "Cleanup artifacts of previous runs"
 
 # containerlab will figure out previous run locations from the docker containers
-previous_topos=$(docker inspect -f '{{ index .Config.Labels "clab-topo-file" }}' $(docker ps -aq))
-for topo in previous_topos; do
- previous_lab_dir=$(dirname $topo)
- mkdir -p "${previous_lab_dir}/clab-mini-lab"
-done
+running_containers=$(docker ps -aq)
+
+if [ ! -z "$running_containers" ]; then
+ previous_topos=$(docker inspect -f '{{ index .Config.Labels "clab-topo-file" }}' $(docker ps -aq))
+ for topo in previous_topos; do
+ previous_lab_dir=$(dirname $topo)
+ mkdir -p "${previous_lab_dir}/clab-mini-lab"
+ done
+fi
 
 make cleanup