Changing path from /only to / fails : Variable $path_no_slash wasn't initialized

[Jaxom99]

Describe the bug

I can not change the url and path of the installed app.

Context

• Hardware: VPS on my proxmox baremetal
• YunoHost version: last
• I have access to my server: Through SSH | through the webadmin | direct access via keyboard / screen | ...
• Are you in a special context or did you perform some particular tweaking on your YunoHost instance?: no
• Using, or trying to install package version/branch: 8.0.1~ynh1

Steps to reproduce

1° Install the app some time ago, with the url : domain.com/only
2° do some upgrades over time, without error
3° Try to change the path : fails with error

Expected behavior

The path should be removed and the url updated.

Simple way out : remove/intall again. But I wanted to signal this for anyone who might need it.

Logs

https://paste.yunohost.org/raw/piwowoyexu