Since PR #137969, the `save` button is no longer available in schedule activity
wizard.
This PR makes `schedule` button available for call activities like other
activities (except meeting), so user can create a call activity without going to
calendar view.
Also, we have to consider `has_error` in creating activity so if there is an
error, user couldn't access to `schedule` button. This field is correctly placed
in `mail.mail_activity_schedule_view_form` view but not in the inherited view
in `calendar`.
task-3668732
closesodoo/odoo#152893
Signed-off-by: Maryam Kia (maki) <maki@odoo.com>
Maryam Kia
e6097043b9