Hey @SionHuws
You can use length function here.
Just do the following:
Add a condition action. In that condition on left side put one of the following expression:
length(outputs('Get_items')?['body/value'])
And put the condition greater than 0.
On if yes side, keep the normal flow actions and in if no, terminate it.

If this was the answer, you were looking for, you can mark this as the solution. If you liked the explanation, you can give a thumbs up/kudo. This really helps. Thanks. 🙂