From dd65ac56efd168d19be577b241621ab6d5a8ebc2 Mon Sep 17 00:00:00 2001
From: Alexander Neumann <alexander@bumpern.de>
Date: Sun, 16 Apr 2017 20:49:20 +0200
Subject: [PATCH] filter: Ignore empty patterns

---
 src/restic/filter/filter.go      | 7 ++++++-
 src/restic/filter/filter_test.go | 1 +
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/restic/filter/filter.go b/src/restic/filter/filter.go
index bb483d31c..37b58f7ef 100644
--- a/src/restic/filter/filter.go
+++ b/src/restic/filter/filter.go
@@ -100,9 +100,14 @@ func match(patterns, strs []string) (matched bool, err error) {
 	return false, nil
 }
 
-// List returns true if str matches one of the patterns.
+// List returns true if str matches one of the patterns. Empty patterns are
+// ignored.
 func List(patterns []string, str string) (matched bool, err error) {
 	for _, pat := range patterns {
+		if pat == "" {
+			continue
+		}
+
 		matched, err = Match(pat, str)
 		if err != nil {
 			return false, err
diff --git a/src/restic/filter/filter_test.go b/src/restic/filter/filter_test.go
index 2fb04cdf5..232e2c4d3 100644
--- a/src/restic/filter/filter_test.go
+++ b/src/restic/filter/filter_test.go
@@ -152,6 +152,7 @@ var filterListTests = []struct {
 	{[]string{"?", "x"}, "/foo/bar/x", true},
 	{[]string{"/*/*/bar/test.*"}, "/foo/bar/test.go", false},
 	{[]string{"/*/*/bar/test.*", "*.go"}, "/foo/bar/test.go", true},
+	{[]string{"", "*.c"}, "/foo/bar/test.go", false},
 }
 
 func TestMatchList(t *testing.T) {