Merge branch 'docker-checks' into 'master'

do not show containers if total is zero

See merge request !232

check_docker_info

@@ -151,7 +151,7 @@ ph.perfadd "images"   "$iImages"
 ph.status "Docker $sVersion ($sLicense) .. containers: $iCTotal running: $iCRunning paused: $iCPaused stopped: $iCStopped .. images: $iImages"
 echo "$out"
 
-if [ $bOptContainers -eq 1 ]; then
+if [ $bOptContainers -eq 1 ] && [ "$iCTotal" -gt "0" ]; then
     echo
     echo "Containers:"
     containers=$( sudo -n --preserve-env docker ps --all --format "{{ json . }}" --all 2>/dev/null )