"NameError: global name 'etng' is not defined" failure on Centos7

[mpasserini]

linotp-adminclient-cli/linotpadminclientcli/cli.py

Line 686 in 462f830

if etng:

I'm getting this error when trying to run the client on Centos 7.8.2003
NameError: global name 'etng' is not defined

I fixed it by defining a global variable etng and setting it to False:

[root@test ~]# vim /usr/bin/linotpadm.py 
[...]
from email.mime.text import MIMEText
+ etng = False
YUBI_STATIC_MODE = 3
[...]