From 263dee8650aca16315a3713fb8e83919fecffa40 Mon Sep 17 00:00:00 2001
From: Dmitrii Pukhov <pukhovdn@yandex.ru>
Date: Tue, 26 Mar 2019 22:39:41 +0900
Subject: [PATCH] Replace ValueError with DvcException

---
 dvc/command/pipeline.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/dvc/command/pipeline.py b/dvc/command/pipeline.py
index c594eb6be..f6b33e9b2 100644
--- a/dvc/command/pipeline.py
+++ b/dvc/command/pipeline.py
@@ -90,10 +90,11 @@ class CmdPipelineShow(CmdBase):
         if not nodes:
             return
         if not is_tree:
-            raise ValueError(
+            raise DvcException(
                 "DAG is not a tree, can not print it in tree-structure way, "
                 "please use --ascii instead"
             )
+
         tree = Tree()
         tree.create_node(target, target)  # Root node
         observe_list = [target]