git-config does not check validity of variable names

Hello,

I've noticed that git-config accepts variable names in the form "a=b" for its
"get" operation.  That means "git config a=b" does not write anything to its
output and exists with status 1.

According to the man page only alphanumeric characters and - are allowed in
variable names.  Would it make sense to spit out an error message when the user
supplies an invalid variable name like the above?

Libor
-- 
Libor Pechacek
SUSE L3 Team, Prague