gitweb: Empty patch for merge means trivial merge, not no differences

Earlier commit 4280cde95f made gitweb
show "No differences found" message for empty diff, for the HTML
output. But for merge commits, either -c format we use or --cc format,
empty diff doesn't mean no differences, but trivial merge.

Show "Trivial merge" message instead of "No differences found" for
merges.

While at it reword conditional in the code for easier reading.

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

gitweb/gitweb.perl

@@ -2877,7 +2877,14 @@ sub git_patchset_body {
 	} continue {
 		print "</div>\n"; # class="patch"
 	}
-	print "<div class=\"diff nodifferences\">No differences found</div>\n" if (!$patch_number);
+
+	if ($patch_number == 0) {
+		if (@hash_parents > 1) {
+			print "<div class=\"diff nodifferences\">Trivial merge</div>\n";
+		} else {
+			print "<div class=\"diff nodifferences\">No differences found</div>\n";
+		}
+	}
 
 	print "</div>\n"; # class="patchset"
 }