[FIX] hr_org_chart : fix hiercharchy view unistallation

STEP TO REPRODUCE:
=================

    * Unistall hr_org_chart application
    * Click on hr application

You will have an error due to the missing hiercharchy view.

closes odoo/odoo#158523

Signed-off-by: Bertrand Dossogne (bedo) <bedo@odoo.com>

addons/hr_org_chart/__init__.py

@@ -3,3 +3,14 @@
 
 from . import controllers
 from . import models
+
+def _uninstall_hook(env):
+    def update_view_mode(view):
+        act_window = env.ref(view, raise_if_not_found=False)
+        if act_window and 'hierarchy' in act_window.view_mode:
+            act_window.view_mode = ','.join(view_mode for view_mode in act_window.view_mode.split(',') if view_mode != 'hierarchy')
+
+    update_view_mode('hr.hr_employee_public_action')
+    update_view_mode('hr.hr_department_kanban_action')
+    update_view_mode('hr.hr_department_tree_action')
+    update_view_mode('hr.open_view_employee_list_my')

addons/hr_org_chart/__manifest__.py

@@ -21,6 +21,7 @@ This module extend the employee form with a organizational chart.
         'views/hr_employee_public_views.xml',
         'views/hr_org_chart_menus.xml',
     ],
+    'uninstall_hook': '_uninstall_hook',
     'assets': {
         'web._assets_primary_variables': [
             'hr_org_chart/static/src/scss/variables.scss',