Warning when using exit_on_error=false

[mdomba]

If exit_on_error is false there is a warning like:

Warning: mysqli_set_charset() expects parameter 1 to be mysqli, boolean given in OBJ_mysql.php on line 121

It can be prevented by changing OBJ_mysql.php line 87, from:

$this->connect();
$this->set_charset($this->charset);

to

if($this->connect())
   $this->set_charset($this->charset);

[entomb]

Fixed as suggested! Thanks again!