There is an option in the section expert that says supress if blank section. I guess you can use this to supress the section if it returns no data.
To display the message you maybe can create a new section below/above the section that returns no data, and add a text field here with the error message. In the section expert write the following code on the supress button "not isnull({field from the section that can be empty})" that way you only display the section when the field is null. If you don't want to add a new section you can just add the text-field to one of the other sections and write the same code on the supress button of the text-field.
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