akeeba/fof — pull request #401 by Eighke (2014-10-21 09:01:51+00:00)
Title: Added emptynonzero model behavior

Check if it is good for you.

I tested for you
```php
return (($value === $this->null_value) || empty($value))
&& !($this->filterzero && $value === "0");
```
Result:
```
// Value	Zero	Result
// NULL	0	(1 || 1) && !(0 && 0) = (1 || 1) && 1 = 1
// ""	0	(1 || 1) && !(0 && 0) = (1 || 1) && 1 = 1
// 0	0	(1 || 1) && !(0 && 1) = (1 || 1) && 1 = 1
// NULL	1	(1 || 1) && !(1 && 0) = (1 || 1) && 1 = 1
// ""	1	(1 || 1) && !(1 && 0) = (1 || 1) && 1 = 1
// 0	1	(1 || 1) && !(1 && 1) = (1 || 1) && 0 = 0
```
Where `Zero` is the behavior enabled or not.