update script

Signed-off-by: Daisuke Sato <[email protected]>

bake-docker.sh

@@ -101,10 +101,12 @@ fi
 
 # replace ros Dockerfile FROM instruction to replace base image
 # this isn't good, but cannot find alternative
-while read -r line; do
-    sed 's=FROM.*=ARG\ FROM_IMAGE\
-FROM\ $FROM_IMAGE=' "$line" > "$line.tmp"
-done < <(find docker/docker_images/ -wholename */$ROS_DISTRO/*/Dockerfile)
+if [[ -e ./docker/docker_images ]]; then
+    while read -r line; do
+        sed 's=FROM.*=ARG\ FROM_IMAGE\
+    FROM\ $FROM_IMAGE=' "$line" > "$line.tmp"
+    done < <(find docker/docker_images/ -wholename */$ROS_DISTRO/*/Dockerfile)
+fi
 
 # bake
 if [[ -n $platform ]]; then