Model Properties set to NULL are not updated in DB

[GoogleCodeExporter]

If a DooModel property is set to null, then it is not updated in the Database 
when using updateAttributes method of DooModel.php.

Following steps will reproduce the problem:
1. Set a model property to null
2. update the model using $object->updateAttributes ($modelPropertiesArray) 
method.
3. Model property which is set to null is not updated in database.

Expected output:
1. If a model property is set to null, then it should be updated in the 
database, e.g. set a timestamp value to null should update it in the database 
and clear any value.

Possible Solution:
Line no. 2340 in DdooSqlMagic.php may be changed:
FROM
====
2340:    if(isset($v) && in_array($o, $model->_fields)){

TO
===
2340:    if(in_array($o, $model->_fields)){

I am using r732 of Doophp from the trunk and PHP 5.4.4-14+deb7u3. 

Original issue reported on code.google.com by mohit.ch...@gmail.com on 14 Aug 2013 at 9:49