Hi, I do not know the version of slitaz used, but to try to reproduce the error with an old installation of mine, it runs correctly.
tux@slitaz:~$ git clone https://github.com/grisbi/grisbi.git
Cloning into 'grisbi'...
remote: Enumerating objects: 73441, done.
remote: Counting objects: 100% (1496/1496), done.
remote: Compressing objects: 100% (605/605), done.
^Ccezione degli oggetti: 17% (12485/73441), 12.32 MiB | 2.18 MiB/s
tux@slitaz:~$ tazpkg search cacert
Search result for: cacert
================================================================================
Installed packages
================================================================================
cacerts 20170224 security
================================================================================
1 installed package found for: cacert
Available packages name-version
================================================================================
cacerts-20190517
================================================================================
1 available packages found for: cacert