Why does "git config" output nothing instead of the default value for unset variables?

Hi,

I'm just wondering why it was decided to work like this. IMHO it's quite inconvenient that git config outputs nothing for any unset (but known) variable. Usually when I query a variable I'm not so much interested in whether it is at all (explicitly) set to some value or not, but what value is currently in use. With that in mind, it would make much more sense for git config to print the implicit default value instead of nothing if a known variable is unset. For unknown / custom variables it still could display nothing, which also gives a nice way to check whether a given variable name is known to Git or not.