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export: only bind commit if it exists

This fixes an edge case with the first commit,
where no parent exists. In that case, we want
to diff against an empty directory.

--- a/export

+++ b/export

@@ -30,14 +30,16 @@

 mntgen /mnt/scratch >[2]/dev/null || status=''

 for(c in $commits){

 	cp=`{git/query -p $c}

-	pp=`{git/query -p $c'^'}

+	pp=`{git/query -p $c'~'}

 	fc=`$nl{git/query -c $c~ $c | sed 's/^..//'}

 	@{

 		rfork n

 		cd /mnt/scratch

-		bind $pp/tree a

-		bind $cp/tree b

+		if(test -d $pp/tree)

+			bind $pp/tree a

+		if(test -d $cp/tree)

+			bind $cp/tree b

 		echo From $c

 		echo From: `{cat $cp/author}