[FIX] mail: activity model domain

Steps to reproduce:
Select a document in activity view to get its preview
Click the archive button => traceback

Before this commit:
The 'load' method of Activity Model led to the traceback while attempting
to set the domain of params, when none were received.
(bug introduced by : 7682286)

After this commit:
This issue is resolved by tweaking the code of 'load' method. In case of
default params, it now directly sets a domain, instead of trying to add a
domain to the one obtained in params.

Task ID : 3704340

closes odoo/odoo#152335

X-original-commit: 725ebab1f0c7ffc996414c85fbbd162afc4ecaf5
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>
Signed-off-by: Khushi Patel (khpa) <khpa@odoo.com>

addons/mail/static/src/views/web/activity/activity_model.js

@@ -9,7 +9,7 @@ export class ActivityModel extends RelationalModel {
         this.originalDomain = params.domain ? [...params.domain] : [];
         // Ensure that only (active) records with at least one activity, "done" (archived) or not, are fetched.
         // We don't use active_test=false in the context because otherwise we would also get archived records.
-        params.domain = [...params.domain, ["activity_ids.active", "in", [true, false]]];
+        params.domain = [...(params.domain || []), ["activity_ids.active", "in", [true, false]]];
         if (params && "groupBy" in params) {
             params.groupBy = [];
         }