In the orderStatistics function from ezorder.php

If you choice a date there is no product sold, you got a fatal error

This is due to a SQL query with a WHERE id IN () empty

Query error (1064): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') ORDER BY id ASC' at line 2.
Query: SELECT id, section_id, owner_id, contentclass_id, name, published, modified, current_version, status, remote_id, language_mask, initial_language_id FROM ezcontentobject WHERE id IN ( ) ORDER BY id ASC

Steps to reproduce

• Go to Webshop tab in the backend
• Choice 'Product statistics' in left menu
• Select a date where is no product sold
• Fatal Error: ....