Impacted versions:
9.0 Community & 9.0 Enterprise

Steps to reproduce:
- Open up a V9 Enteprise Runbot
- Go to projects and open up the issues for the project 'Data Import/Export Plugin'
- Click on 'Create' to create a new issue. You will see the following form:
  ![image](https://cloud.githubusercontent.com/assets/6352350/13873556/8f826fbc-ecf2-11e5-95aa-e5cd7965b976.png)
  Notice how the Contact is filled in with the name 'Delta PC' and that no e-mail is filled in. When you open up this contact its form you will see he has an e-mail filled in:
  ![image](https://cloud.githubusercontent.com/assets/6352350/13873580/afd81f0a-ecf2-11e5-960f-91e14a999578.png)
- Remove the contact on the issue, click somewhere else and now fill in the contact again. The moment you add the contact again the onchange function goes off and the e-mail is filled in automatically:
  ![image](https://cloud.githubusercontent.com/assets/6352350/13873605/d0884068-ecf2-11e5-8892-5fcd0fc692b2.png)

Current behavior:
When clicking on 'Create' for creating a new issue on a project the customer its e-mail is not automatically filled in because the onchange does not seem to have an effect on the record.

Expected behavior:
When click on 'Create' for creating a new issue on a project the customer his e-mail is filled in automatically (provided there is one).

if not task_id:
            return {'value': {}}
        task = self.pool.get('project.task').browse(cr, uid, task_id, context=context)
        return {'value': {'user_id': task.user_id.id, }}
    def onchange_partner_id(self, cr, uid, ids, partner_id, context=None):
        """ This function returns value of partner email address based on partner
            :param part: Partner's id
        """
        result = {}
        if partner_id:
            partner = self.pool['res.partner'].browse(cr, uid, partner_id, context)
            result['email_from'] = partner.email
        return {'value': result}
    def get_empty_list_help(self, cr, uid, help, context=None):
        context = dict(context or {})
        context['empty_list_help_model'] = 'project.project'
        context['empty_list_help_id'] = context.get('default_project_id')
        context['empty_list_help_document_name'] = _("issues")
        return super(project_issue, self).get_empty_list_help(cr, uid, help, context=context)
    # --
    # St
    # --
    def onchange_stage_id(self, cr, uid, ids, stage_id, context=None):
        if not stage_id:
            return {'value': {}}
        stage = self.pool['project.task.type'].browse(cr, uid, stage_id, context=context)
        if stage.fold:
            return {'value': {'date_closed': fields.datetime.now()}}
        return {'value': {'date_closed': False}}
    def stage_find(self, cr, uid, cases, section_id, domain=[], order='sequence', context=None):