[turba] Log spam

[Arjen de Korte]

Citeren Arjen de Korte <build+horde at de-korte.org>:

> I frequently see the following errors in the Horde log. Probably  
> just log spam, but nevertheless, I'll report it here:
>
> 2019-01-02T21:41:08+01:00 WARN: horde [turba] PHP ERROR: Illegal  
> offset type in isset or empty [pid 30217 on line 543 of  
> "/srv/www/htdocs/horde/turba/lib/Driver.php"]
>
> I added a Horde::debug statement for the $attribute parameter, the  
> result is in the attached log.

This is for an installation from PEAR (up-to-date) and PHP 7.3.