[FIX] marketing_campaign: method not implemented

In the Lead Automation module, the module is working as expected when
the activity type is 'Email'. In other cases, the corresponding methods
are not implemented and raise an error.

opw-697829

addons/marketing_campaign/models/marketing_campaign.py

@@ -340,6 +340,16 @@ class MarketingCampaignActivity(models.Model):
         self.ensure_one()
         return self.email_template_id.send_mail(workitem.res_id)
 
+    @api.multi
+    def _process_wi_report(self, workitem):
+        self.ensure_one()
+        return self.report_id.render_report(workitem.res_id, self.report_id.report_name, None)
+
+    @api.multi
+    def _process_wi_action(self, workitem):
+        self.ensure_one()
+        return self.server_action_id.run()
+
     @api.multi
     def process(self, workitem):
         self.ensure_one()