I feel that a checker should be provided that checks the various configuration files -koha-conf.xml is a prime suspect- and notify the library admin of missing stanzas or invalid values. For example, missing information on fonts to be used, or reference to non-existent (or non-accessible) files and/or folders.
We already have some checks in place and the results show on the system information tab on the About Koha page. The fonts section missing could be another to add. Maybe we could change this bug report to cover that.
Closing this one for now since it's too broad. Feel free to re-open and re-name