roundcubemail-core-1.4-209.2.el7.kolab_16.noarch contains the following scriptlet section:

/usr/share/roundcubemail/bin/updatedb.sh \
    --dir /usr/share/doc/roundcubemail-core-1.4-rc1.27/SQL/ \
    --package roundcube || : \
    >/dev/null 2>&1

But that directory does not exist, resulting in:

Error 500: Specified database schema directory doesn't exist.

on upgrade.

Also, you probably do not want to attempt to redirect stderr as this would hide errors like this.