Fix request without attachment

app/api/resources/mail_manager/mail_manager.py

@@ -35,12 +35,13 @@ async def send_email_wtih_attachment_async(tq):
         message["Subject"] = f"{tq['subject']} - {tq['request'].headers['Host']}"
         body = await format_message(tq)
         message.set_content(body)
-        for attachment in tq["files"]:
-            maintype, subtype = attachment.content_type.split('/', 1)
-            message.add_attachment(attachment.file.read(),
-                                  maintype=maintype, 
-                                  subtype=subtype,
-                                  filename=attachment.filename)
+        if tq["files"] is not None:
+            for attachment in tq["files"]:
+                maintype, subtype = attachment.content_type.split('/', 1)
+                message.add_attachment(attachment.file.read(),
+                                      maintype=maintype, 
+                                      subtype=subtype,
+                                      filename=attachment.filename)
         await aiosmtplib.send(message, hostname=Envs.MAIL_SERVER, port=Envs.MAIL_PORT)
         logger.info(f"The email sent successfully for {tq['email']}")
         return True