combined rm commands

lib/design.sh

@@ -94,8 +94,7 @@ design() {
     echo "Trimming empty design directories for $project..."
     for dir in $(find $project_design_dir/ -type d -empty); do
       asset=$(basename $dir)
-      rm -rf "$root_design_dir/$project/$asset"
-      rm -rf $project_design_dir/$asset
+      rm -rf "$root_design_dir/$project/$asset" "$project_design_dir/$asset"
     done
     # Remove design dir from project if there's nothing in it.
     if find $project_design_dir -type d -empty | grep -q $project_design_dir; then