markup/email.py: don't send email if EMAIL_HOST setting is None

markup/email.py

@@ -85,6 +85,10 @@ def send_error_email(subj, einfo):
 
 
 def send(frm, subj, msg):
+    if not EMAIL_HOST:
+        log.info(f'not sending email')
+        return
+
     msg['From'] = 'Keen ProCatalog Markup Bot <markup@procatalog.io>'
     msg['Reply-To'] = 'Keen ProCatalog Support <support@procatalog.io>'
     msg['To'] = frm