Don't throw an error if users aren't found - just print a notice.

backup/restore_execute.html

@@ -176,8 +176,7 @@
                 echo "<li>".get_string("teachers").": ".$teacher_count;
                 echo "</ul>";
             } else {
-                notify("Something is wrong - no users were found!");
-                $status = false;
+                notify("No users were found!");
             }
         }
     }