motd.sh: Make docker optional

motd.sh

@@ -57,6 +57,7 @@ done
 
 
 ### Docker ###
+if command -v docker &> /dev/null; then
 	out+="${bold}[DOCKER]${undim}\n"
 	containers=($(docker ps --format "{{.Image}}/{{.Names}}"))
 	container_statuses=($(docker ps --format "{{.State}}"))
@@ -95,6 +96,7 @@ for user in ${rootless_users[@]}; do
 		done
 	done
 	out+=$docker_out
+fi
 
 printf "$out" | column -ts $',' -o " "
 echo -e