From c8ce85ae37236c43c6733b07948abd5d4380e008 Mon Sep 17 00:00:00 2001
From: Ned Batchelder <ned@nedbatchelder.com>
Date: Thu, 13 Dec 2012 21:13:32 -0500
Subject: pyratemp somehow claims code came from ''. Fixes #221.

---
 coverage/control.py | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'coverage/control.py')

diff --git a/coverage/control.py b/coverage/control.py
index 115d26c3..80495ef4 100644
--- a/coverage/control.py
+++ b/coverage/control.py
@@ -209,6 +209,10 @@ class coverage(object):
         should not.
 
         """
+        if not filename:
+            # Empty string is pretty useless
+            return False
+
         if filename.startswith('<'):
             # Lots of non-file execution is represented with artificial
             # filenames like "<string>", "<doctest readme.txt[0]>", or
-- 
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