11 fix panic

Closes #11 (closed)

handler/handler.go

@@ -95,6 +95,7 @@ func (s *KeyStorageServerImpl) GetKey(ctx context.Context, in *api.GetKeyRequest
 
 	data, err := client.DoGetDataCall("keys", in.Uuid+"/"+api.KeyType.String(in.KeyType))
 	if err != nil {
+		log.Printf("grpc call DoGetDataCall to DataStorage failed: %s", err)
 		getKeyResponse.Key = nil
 		getKeyResponse.StatusList = utils.AddStatus(getKeyResponse.StatusList,
 			"500", api.StatusType_ERROR, err.Error())
@@ -136,6 +137,7 @@ func (s *KeyStorageServerImpl) SetKey(ctx context.Context, in *api.SetKeyRequest
 
 	data, err := client.DoGetDataCall("keys", in.Uuid+"/"+api.KeyType.String(in.KeyType))
 	if err != nil {
+		log.Printf("grpc call DoGetDataCall to DataStorage failed: %s", err)
 		setKeyResponse.StatusList = utils.AddStatus(setKeyResponse.StatusList,
 			"500", api.StatusType_ERROR, err.Error())
 		return setKeyResponse, nil