Requests from an Organization aren't exported from the Customer portal

Xporter can't export correctly the requests who belongs to an organization.

Steps to reproduce the problem:

1. Create a new organization and add customers to the newest organization
2. After this, add the organization for each request created
3. Go to the customer portal and perform the export using a template (for example Issue List Excel)
4. You will notice the requests exported are the ones who have the customer as a requester or participant

Expected Result:

The customer must be able to export all the requests who belong to an organization from the Customer Portal.