Separated Resend initialization failure in email handler.

src/alerts.js

@@ -448,7 +448,12 @@ const frequencies = {
 };
 
 async function sendEmailAlerts() {
-	if (!config.email.enabled || !resend) {
+	if (!config.email.enabled) {
+		return;
+	}
+
+	if (!resend) {
+		logger.warn('E-mails are enabled, but Resend is not initialized');
 		return;
 	}