'git diff HEAD' pager quirks

So, after a 'yum upgrade' brought me git-core-1.4.4.2-2.fc6, I 
discovered that "git diff HEAD" will produce paged output, if at a tty. 
  Nice, I like the improvement.

However, when there is no output at all (nothing dirty in working dir), 
"git diff HEAD" will sometimes invoke $PAGER ("/usr/bin/less" here) 
__anyway__.

This causes the cursor to jump down 20-30 lines, before returning the 
command prompt.  Annoying.  Example follows.

	Jeff


---------------------<begin BEFORE>----------------------------
[jgarzik@pretzel libata-dev]$ git diff HEAD
[jgarzik@pretzel libata-dev]$
---------------------<end BEFORE>------------------------------

---------------------<begin AFTER>-----------------------------
[jgarzik@pretzel libata-dev]$ git diff HEAD



















[jgarzik@pretzel libata-dev]$
---------------------<end AFTER>-------------------------------
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