Does not install on YunoHost 3.3

[anubister]

Hello,
I'm unable to install this app on a quite fresh YunoHost 3.3 install :

Warning: 'yunohost app checkurl' is deprecated and will be removed in the future
Warning: Packagers /!\ : 'app checkurl' is deprecated ! Please use the helper 'ynh_webpath_register' instead !
Warning: _common.sh: line 47: $1: unbound variable
Warning: 
Info: The operation 'Install 'openvpn' application' has failed ! To get help, please share the full log of this operation using the command 'yunohost log display 20190121-234836-app_install-openvpn --share'
Warning: Failed to stop openvpn.service: Unit openvpn.service not loaded.
Warning: iptables v1.6.0: Empty interface is likely to be undesired
Warning: Try `iptables -h' or 'iptables --help' for more information.
Warning: Unknown service 'openvpn'
Warning: The user openvpn was not found
Warning: The user openvpnweb was not found
Warning: E: Unable to locate package openvpn-ynh-deps

Full log : https://paste.yunohost.org/raw/ibunerequd

All default options were selected during installation.

[anubister]

Also not working on YunoHost 3.6.5.3:
2020-03-17 21:16:53,430: WARNING - _common.sh: ligne 47: $1 : variable sans liaison