[FIX] send nex prm mail only if changes

models/acc_operation.py

@@ -297,7 +297,7 @@ class AccOperation(models.Model):
             type_log="cron" if from_cron else "api",
             updated_objects="<br/>".join(counter_used),
         )
-        if from_cron:
+        if from_cron and counter_used:
             log_id.send_new_prm_email()
 
         return log_id