git-diff should not fire up $PAGER if there is no diff

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Subject: git-diff should not fire up $PAGER if there is no diff
From: jidanni@xxxxxxxxxxx
Date: Tue, 16 Dec 2008 08:21:33 +0800

git-diff should not fire up $PAGER if there is no diff output.
Just exit. The man page doesn't even mention $PAGER too.
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