From 0aca562f8a632a7a0c49934c36b1ac2cf9928cd6 Mon Sep 17 00:00:00 2001
From: Andrew Sultana <andrew.sultana@mail.com>
Date: Tue, 13 Mar 2018 11:26:33 +0000
Subject: [PATCH] Fix `do_outdated()` when `pip freeze` is blank

- If no packages are installed, `results` contains a single empty string. This causes problems in the subsequent call to `convert_deps_from_pip`. Therefore filter out empty strings from `results` to avoid this.
- Fixes #1699
---
 pipenv/core.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pipenv/core.py b/pipenv/core.py
index 9886ede2fb..16e947f58a 100644
--- a/pipenv/core.py
+++ b/pipenv/core.py
@@ -1701,6 +1701,7 @@ def do_py(system=False):
 def do_outdated():
     packages = {}
     results = delegator.run('{0} freeze'.format(which('pip'))).out.strip().split('\n')
+    results = filter(bool, results)
     for result in results:
         packages.update(convert_deps_from_pip(result))