filter: Ignore empty patterns

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

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) {