gitweb: Fix thinko in git_tags and git_heads
git_get_refs_list always return reference to list (and reference to hash which we ignore), so $taglist (in git_tags) and $headlist (in git_heads) are always defined, but @$taglist / @$headlist might be empty. Replaced incorrect "if (defined @$taglist)" with "if (@$taglist)" in git_tags and respectively in git_heads. Signed-off-by: NJakub Narebski <jnareb@gmail.com> Signed-off-by: NJunio C Hamano <junkio@cox.net>
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