gitweb: clarify search results page when no matching commit found

When searching commits for a string that never occurs, the results
page looks something like this:

	projects / foo.git / search                                 \o/
	summary | ... | tree          [commit] search: [ kfjdkas ] [ ]re
	first ⋅ prev ⋅ next

	Merge branch 'maint'

	Foo: a demonstration project

Without a list of hits to compare it to, the header describing the
commit named by the hash parameter (usually HEAD) may itself look
like a hit.  Add some text (“No match.”) to replace the empty
list of hits and avoid this confusion.

While at it, remove some nearby dead code, left behind from a
simplification a few years ago (v1.5.4-rc0~276^2~4, 2007-11-01).

Noticed-by: Erick Mattos <erick.mattos@gmail.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Acked-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

gitweb/gitweb.perl

@@ -6522,12 +6522,13 @@ sub git_search {
 			$paging_nav .= " ⋅ next";
 		}
 
-		if ($#commitlist >= 100) {
-		}
-
 		git_print_page_nav('','', $hash,$co{'tree'},$hash, $paging_nav);
 		git_print_header_div('commit', esc_html($co{'title'}), $hash);
-		git_search_grep_body(\@commitlist, 0, 99, $next_link);
+		if ($page == 0 && !@commitlist) {
+			print "<p>No match.</p>\n";
+		} else {
+			git_search_grep_body(\@commitlist, 0, 99, $next_link);
+		}
 	}
 
 	if ($searchtype eq 'pickaxe') {