In https://github.com/vyos/vyos.vyos/pull/403/files#diff-55d967f7efb21cec719c5ad71ac942a7769acf87c6e2747720fde15f62fa1fadR376, I forgot to add a check for a empty commands variable.

The fix is easy, just need another bug number to add to the commit.

No reproduce steps for now, but it should be obvious.