t0027: do not use an empty string as a pathspec element

In an upcoming update, we will finally make an empty string illegal
as an element in a pathspec; it traditionally meant the same as ".",
i.e. include everything, so update this test that passes "" to pass
a dot instead.

At this point in the test sequence, there is no modified path that
need to be further added before committing; the working tree is
empty except for .gitattributes which was just added to the index.
So we could instead pass no pathspec, but this is a conversion more
faithful to the original.

Signed-off-by: Junio C Hamano <[email protected]>

Author: gitster

t/t0027-auto-crlf.sh

@@ -322,7 +322,7 @@ test_expect_success 'setup master' '
 	echo >.gitattributes &&
 	git checkout -b master &&
 	git add .gitattributes &&
-	git commit -m "add .gitattributes" "" &&
+	git commit -m "add .gitattributes" . &&
 	printf "\$Id: 0000000000000000000000000000000000000000 \$\nLINEONE\nLINETWO\nLINETHREE"     >LF &&
 	printf "\$Id: 0000000000000000000000000000000000000000 \$\r\nLINEONE\r\nLINETWO\r\nLINETHREE" >CRLF &&
 	printf "\$Id: 0000000000000000000000000000000000000000 \$\nLINEONE\r\nLINETWO\nLINETHREE"   >CRLF_mix_LF &&