[PATCH] add: don't complain when adding empty project root

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

This behavior was added in 07d7bed (add: don't complain when adding
empty project root - 2009-04-28) then broken by 84b8b5d (remove
match_pathspec() in favor of match_pathspec_depth() -
2013-07-14). Reinstate it.

Noticed-by: Thomas Ferris Nicolaisen <tfnico@gmail.com>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 builtin/add.c  | 2 +-
 t/t3700-add.sh | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/builtin/add.c b/builtin/add.c
index 226f758..fbd3f3a 100644
--- a/builtin/add.c
+++ b/builtin/add.c
@@ -544,7 +544,7 @@ int cmd_add(int argc, const char **argv, const char *prefix)
 
 		for (i = 0; i < pathspec.nr; i++) {
 			const char *path = pathspec.items[i].match;
-			if (!seen[i] &&
+			if (!seen[i] && pathspec.items[i].match[0] &&
 			    ((pathspec.items[i].magic &
 			      (PATHSPEC_GLOB | PATHSPEC_ICASE)) ||
 			     !file_exists(path))) {
diff --git a/t/t3700-add.sh b/t/t3700-add.sh
index aab86e8..1535d8f 100755
--- a/t/t3700-add.sh
+++ b/t/t3700-add.sh
@@ -307,4 +307,8 @@ test_expect_success 'git add --dry-run --ignore-missing of non-existing file out
 	test_i18ncmp expect.err actual.err
 '
 
+test_expect_success 'git add -A on empty repo does not error out' '
+	git init empty && ( cd empty && git add -A . )
+'
+
 test_done
-- 
1.8.5.2.240.g8478abd