Check if we should to send the membership fees email from the model

Add an extra check in the model if call with auto=True.

coin/members/models.py

@@ -280,6 +280,9 @@ class Member(CoinLdapSyncMixin, AbstractUser):
 
         :param auto: is it an auto email? (changes slightly template content)
         """
+        if auto and not self.send_membership_fees_email:
+            return False
+
         from dateutil.relativedelta import relativedelta
         from coin.isp_database.models import ISPInfo