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Re: bin/50834 (/bin/sh incorrectly treats ${unset_or_null_var:-} as '')

The following reply was made to PR bin/50834; it has been noted by GNATS.

From: Robert Elz <kre%munnari.OZ.AU@localhost>
Subject: Re: bin/50834 (/bin/sh incorrectly treats ${unset_or_null_var:-} as '')
Date: Sat, 05 Mar 2016 03:04:34 +0700

 For the record (which should be no surprise given the implementation)
 the same is true of ${x+} if x is set.
 And probably related, so I am going to include it in this PR,
 the shell expands the arg to ':' in...
 	set --; :	$@""
 as nothing, rather than as a null string as it should.  It does however
 do the right thing with
 	set --; : ""$@
 (to be observable, you'd want a different test case than this one of course).

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