gitweb: Use "return" instead of "return undef" for some subs
Use "return" instead of "return undef" when subroutine can return, or always return, non-scalar (list) value. Other places are left as is. Signed-off-by: NJakub Narebski <jnareb@gmail.com> Signed-off-by: NJunio C Hamano <junkio@cox.net>
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