Fixed check if MAIL_SERVER is set

mail.py

@@ -14,7 +14,7 @@ def send_message(msgtype, recipients, **kwargs):
 	try:
 		msg['Subject'] = render_template('mails/'+msgtype+'.subject', **kwargs)
 		msg.set_content(render_template('mails/'+msgtype+'.body', **kwargs))
-		if 'MAIL_SERVER' not in config:
+		if not config.get('MAIL_SERVER'):
 			return
 		s = smtplib.SMTP(config['MAIL_SERVER'])
 		if config.get('MAIL_ADDRESS_OVERWRITE'):