ensure undefined replyTo doesn't overwrite default

Author: CarsonF

src/components/dbl-upload-notification/handlers/dbl-upload-notification.handler.ts

@@ -126,7 +126,7 @@ export class DBLUploadNotificationHandler
         .render(DBLUpload, props)
         .with({
           to,
-          ...(this.config.email.notifyDblUpload && {
+          ...(this.config.email.notifyDblUpload?.replyTo && {
             'reply-to': this.config.email.notifyDblUpload.replyTo,
           }),
         })