Show loader on cancel

[MAILPOET-2693]

assets/js/src/settings/pages/send_with/other/activate_or_cancel.tsx

@@ -1,6 +1,7 @@
 import React from 'react';
 import { useHistory } from 'react-router-dom';
 
+import MailPoet from 'mailpoet';
 import { t } from 'common/functions';
 import { useAction } from 'settings/store/hooks';
 
@@ -14,8 +15,10 @@ export default function ActivateOrCancel() {
   };
   const cancel = async (e) => {
     e.preventDefault();
+    MailPoet.Modal.loading(true);
     await loadSettings();
     history.push('/mta');
+    MailPoet.Modal.loading(false);
   };
   return (
     <p>

assets/js/src/settings/store/actions.ts

@@ -206,6 +206,9 @@ export function* reinstall() {
 }
 
 export function* sendTestEmail(recipient: string, mailer: Settings['mta']) {
+  if (!recipient) {
+    return { type: 'TEST_EMAIL_FAILED', error: [t('cantSendEmail')] };
+  }
   yield { type: 'START_TEST_EMAIL_SENDING' };
   const res = yield {
     type: 'CALL_API',