report: fix checking attachments when checking if the report is empty

mylib/report.py

@@ -132,7 +132,7 @@ class Report(ConfigurableObject):  # pylint: disable=useless-object-inheritance
             " email_client"
         )
         content = self.get_content()
-        if not content:
+        if not content and not self._attachment_files and not self._attachment_payloads:
             log.debug("Report is empty, do not send it")
             return True
         msg = email_client.forge_message(