[horde] some error messages

[Wilmer Guamán]

all cvs versions and php 4.3.

got

undefined index _charset_ in:
  mnemo/lib/Driver/sql.php on line 149,150
  nag/lib/Driver/sql.php on line 149,150


and 

 output handler 'og_gzhandler' cannot be used twice in Unknown ... 

mfG,
Geo

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