[horde] HEAD: Warnings from Horde::addScriptFile

[Rick Emery]

Quoting Chris Hastie <lists at oak-wood.co.uk>:

> Having just done a cvs update I'm getting the following warning in lots
> of places:
> 
> Warning: Wrong datatype for first argument in call to array_key_exists
> in /usr/local/www/mail/data/horde/lib/Horde.php on line 262
> 
> It appears to be connected with setting $app=null by default.
> --
> Chris Hastie

I got these warnings also.

I'm not sure if it's the *correct* fix, but the attached diff got rid of my
warnings, and page loading seems to be back up to speed. I just moved a block of
code down.

hth,
Rick
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