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HTTPS or Subversion.
Some issues w/ user configuration (either w/ Piwik or PHP) will not be reported correctly (or at all). The script should be as descriptive of errors as possible.
Reported on forum here: http://forum.piwik.org/read.php?2,95012
(In ) Fixes #3446, added better error reporting for geoipUpdateRows.php and modified it to be usable even w/ (some) improper Piwik Geolocation configuration.