Build #1272

If you click on "Unread posts", obtained when no unread posts exist, the following debug message:
phpBB Debug] PHP Warning: in file [ROOT]/phpbb/pagination.php on line 225: Division by zero
[phpBB Debug] PHP Warning: in file [ROOT]/phpbb/pagination.php on line 239: Division by zero
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions.php on line 5026: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3866)
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions.php on line 5028: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3866)
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions.php on line 5029: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3866)
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions.php on line 5030: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3866)