[FIX] mail: add "To: No recipient" when there is no followers

task-3611153

closes odoo/odoo#148570

X-original-commit: 5f4f89a3573736c70c96e82d4cd12423a94ebb2e
Signed-off-by: Didier Debondt (did) <did@odoo.com>

addons/mail/static/src/core/web/chatter.js

@@ -225,6 +225,9 @@ export class Chatter extends Component {
      * @returns {string}
      */
     get toRecipientsText() {
+        if (this.state.thread?.recipients.length === 0) {
+            return _t("No recipient");
+        }
         const recipients = [...(this.state.thread?.recipients ?? [])]
             .slice(0, 5)
             .map(({ partner }) => {

addons/mail/static/src/core/web/chatter.xml

@@ -72,10 +72,10 @@
                 </button>
             </div>
             <t t-if="state.composerType">
-                <t t-if="state.composerType === 'message' and state.thread.recipients.length > 0">
+                <t t-if="state.composerType === 'message'">
                     <div class="flex-shrink-0 px-3 pt-3 text-truncate small mb-2" style="margin-left:48px">
                         <span class="fw-bold">To:</span> <t t-out="toRecipientsText"/>
-                        <button class="o-mail-Chatter-recipientListButton btn btn-link badge rounded-pill border-0 p-1 ms-1" title="Show all recipients" t-on-click="onClickRecipientList">
+                        <button t-if="state.thread.recipients.length > 0" class="o-mail-Chatter-recipientListButton btn btn-link badge rounded-pill border-0 p-1 ms-1" title="Show all recipients" t-on-click="onClickRecipientList">
                             <i class="fa fa-caret-down"/>
                         </button>
                     </div>