stores/yaml: fix failing test (empty data)

Signed-off-by: Martin Holst Swende <martin@swende.se>

Author: holiman

stores/yaml/store.go

@@ -294,7 +294,7 @@ func (store *Store) LoadEncryptedFile(in []byte) (sops.Tree, error) {
 // sops.Tree runtime object
 func (store *Store) LoadPlainFile(in []byte) (sops.TreeBranches, error) {
 	var branches sops.TreeBranches
-	{
+	if len(in) > 0 {
 		// This is needed to make the yaml-decoder check for uniqueness of keys
 		// Can probably be removed when https://github.com/go-yaml/yaml/issues/814 is merged.
 		if err := yaml.NewDecoder(bytes.NewReader(in)).Decode(make(map[string]interface{})); err != nil {