Fix growpart error when missing.

If the virtual machine don't have cloud-utils intalled this script print errors.
I test if growpart command is available before running the action

base/etc/one-context.d/07-grow-rootfs

@@ -1,5 +1,10 @@
 #!/bin/bash
 
+GROWPART=$(which growpart)
+if [[ ${?} -ne 0 ]]
+then
+  echo "Skipping growfs, growpart command is missing"
+else
   MOUNT_LINE=$(cat /etc/mtab | grep ' / ' | grep -v '^rootfs')
 
   DEVICE=$(echo "$MOUNT_LINE" | cut -d' ' -f1)
@@ -26,4 +31,4 @@ xfs)
       xfs_growfs /
       ;;
   esac
-
+fi