[FIX] project : portal user view parent task

How to reproduce the bug :
    - Go to one project from portal user
    - Open a task
    - Create a subtask of this task
    - Open the subtask
    - Click on "Parent Task" button
    => Traceback

Fix :
    - The search view is not loaded when opening the parent task
    - We add manually the search view id in the action opening the
    parent

taskid:3551354

closes odoo/odoo#156183

X-original-commit: 536638a92d6d7b242e27ae6f73431c61267b4eeb
Signed-off-by: Xavier Bol (xbo) <xbo@odoo.com>

addons/project/models/project_task.py

@@ -1567,6 +1567,7 @@ class Task(models.Model):
             'search_view_ref': 'project.project_sharing_project_task_view_search',
         }).action_open_parent_task()
         action['views'] = [(self.env.ref('project.project_sharing_project_task_view_form').id, 'form')]
+        action['search_view_id'] = self.env.ref("project.project_sharing_project_task_view_search").id
         return action
 
     # ------------