Do not abort execute-lxcs on a container that is not Debian or Ubuntu

The skip message printed $name, which is only set once a container has
run the command. When a non-Debian container (Alpine, for example) came
before any Debian one, set -u ended the run there with "name: unbound
variable" and exit 1; later it printed the previous container's name.

tools/pve/execute.sh

@@ -67,7 +67,7 @@ for container in $(pct list | awk '{if(NR>1) print $1}'); do
   else
     os=$(pct config "$container" | awk '/^ostype/ {print $2}')
     if [ "$os" != "debian" ] && [ "$os" != "ubuntu" ]; then
-      echo -e "${BL}[Info]${GN} Skipping ${name} ${RD}$container is not Debian or Ubuntu ${CL}"
+      echo -e "${BL}[Info]${GN} Skipping ${RD}$container is not Debian or Ubuntu ${CL}"
       continue
     fi