Search for non-existing values now returns nothing.

app/Helpers/Collector/GroupCollectorInterface.php

@@ -57,6 +57,13 @@ interface GroupCollectorInterface
      */
     public function amountLess(string $amount): GroupCollectorInterface;
 
+    /**
+     * Ensure the search will find nothing at all, zero results.
+     *
+     * @return GroupCollectorInterface
+     */
+    public function findNothing(): GroupCollectorInterface;
+
     /**
      * Get transactions where the amount is more than.
      *