[FIX] web_editor: prevent traceback on destroy link tools

When saving a mailing with the link tools open, link tools' destroy
is called after OdooEditor's destroy, causing a traceback when link
tools tries to set a history step.

task-2733825

closes odoo/odoo#84354

X-original-commit: f565f965fdc15d744efd38cfca9b098e24181e7e
Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>

addons/web_editor/static/src/js/wysiwyg/widgets/link_tools.js

@@ -66,7 +66,9 @@ const LinkTools = Link.extend({
         this.$button.removeClass('active');
         this.options.wysiwyg.odooEditor.observerActive();
         this.applyLinkToDom(this._getData());
-        this.options.wysiwyg.odooEditor.historyStep();
+        if (!this.options.wysiwyg.odooEditor.isDestroyed) {
+            this.options.wysiwyg.odooEditor.historyStep();
+        }
         this._observer.disconnect();
         this._super(...arguments);
     },