[FIX] sale_timesheet: recompute delivered qty

- Create a product with 'Service Tracking' as 'Create a task in a new
  project'
- Create a SO with this product, validate
- In the created task, add a timesheet line

The delivered quantity is not updated on the SO.

In method `_analytic_compute_delivered_quantity`, the item is skipped if
the field `product_uom_id` is not set on the analytic line. However,
`product_uom_id` is set in method `_timesheet_postprocess`, which is
called after `_analytic_compute_delivered_quantity`.

Therefore, we move this part in `_timesheet_preprocess`.

opw-805533

addons/sale_timesheet/models/account.py

@@ -42,6 +42,11 @@ def _timesheet_preprocess(self, values):
         if 'task_id' in values:
             task = self.env['project.task'].sudo().browse(values['task_id'])
             values['so_line'] = task.sale_line_id.id or values.get('so_line', False)
+
+        # Set product_uom_id now so delivered qty is computed in SO line
+        if not 'product_uom_id' in values and all([v in values for v in ['employee_id', 'project_id']]):
+            employee = self.env['hr.employee'].sudo().browse(values['employee_id'])
+            values['product_uom_id'] = employee.company_id.project_time_mode_id.id
         return values
 
     @api.multi