counterCache - CakePHP 2.0

#### What I did


Added a cacheCounter onto a $belongsTo relationship where the DB will accept NULL for the foreign_key

For Example: Addresses haveMany Users, but a users does not have to have an address.

#### What happened

When I went to delete the User I got the following error:

UPDATE [addresses] SET [user_count] = 0 WHERE [id] IS N''

It is trying to update the cacheCounter when the relationship does not exist.


#### What I expected to happen

When I create the User ($this->User->save) with an address_id of NULL, or even edit the User ($this->User->save) I do not get the error??

Is there something I can put into the counterScope to stop this from happening??

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