Query List - stopping scheduled workflow when no results are provided

I have a scheduled workflow that runs daily which:

1. queries a list within the site looking for any items matching the criteria specified
2. loops through each of the items identified and gathers information
3. builds a string of that information
4. sends an email with the information compiled 

I am looking for help please to figure out how to end the workflow where there are no items identified at step 1 thus preventing the email from being sent out with no information.

Please see screen shots below which might assist and thanks in advance for any help 🙂