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difftool: silence uninitialized variable warning
Git::config() returns `undef` when given keys that do not exist. Check that the $guitool value is defined to prevent a noisy "Use of uninitialized variable $guitool in length" warning. Signed-off-by: David Aguilar <davvid@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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