File pip_no_plugins.patch of Package python-straight-plugin

From fbe969310abfb0294313372da20a4b7dc99ea0a8 Mon Sep 17 00:00:00 2001
From: Lars van de Kerkhof <lars@permanentmarkers.nl>
Date: Thu, 28 Jun 2018 15:40:39 +0200
Subject: [PATCH 1/3] Fixes pip with no plugins installed.

---
 straight/plugin/manager.py | 2 +-
 tests.py                   | 5 ++++-
 2 files changed, 5 insertions(+), 2 deletions(-)

--- a/straight/plugin/manager.py
+++ b/straight/plugin/manager.py
@@ -50,7 +50,7 @@ class PluginManager(object):
 
         Useful to utilize plugins as sets of filters.
         """
-
+        r = first_arg
         for plugin in self._plugins:
             method = getattr(plugin, methodname, None)
             if method is None:
--- a/tests.py
+++ b/tests.py
@@ -257,9 +257,12 @@ class PluginManagerTestCase(unittest.Tes
             return x + 1
         self.m._plugins[0].x.side_effect = plus_one
         self.m._plugins[1].x.side_effect = plus_one
-
         self.assertEqual(3, self.m.pipe('x', 1))
 
+    def test_pipe_no_plugins_found(self):
+        no_plugins = manager.PluginManager([])
+        self.assertEqual(1, no_plugins.pipe('x', 1))
+
     def test_call(self):
         results = self.m.call('x', 1)
         self.assertTrue(self.m._plugins[0].called_with('a'))