KLocale::formatNumber fails for locales without ThousandsSeparator

[Albert Astals Cid]

Hi John, just realized that KLocale::formatNumber fails to return 10 when 
passing in "10" (returns 0) if ThousandsSeparator is empty (like it is for 
Spain and lots of other locales).

The problem is in KLocalePrivate::parseDigitGroup, but i gave a quick look and 
decided you could fix it faster than me since you already know what the code 
is supposed to be doin ;-)

Could have a look? If you are too busy say so and i'll try again since this is 
making Okular zoom input not work at all.

Albert