[damned-lies] Fixed conditional test in run_shell_command

[Claude Paroz <claudep src gnome org>]

commit 1c53313f7e5025066c333e3849d1aae08f75b3cc
Author: Claude Paroz <claude 2xlibre net>
Date:   Fri Oct 24 19:05:49 2014 +0200

    Fixed conditional test in run_shell_command

 stats/utils.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/stats/utils.py b/stats/utils.py
index 49658d0..c5d3022 100644
--- a/stats/utils.py
+++ b/stats/utils.py
@@ -127,7 +127,7 @@ def run_shell_command(cmd, input_data=None, raise_on_error=False, **popen_kwargs
     stdin = None
     if input_data:
         stdin = PIPE
-    if 'env' in popen_kwargs:
+    if popen_kwargs.get('env'):
         os.environ.update(popen_kwargs['env'])
         popen_kwargs['env'] = os.environ
     shell = not isinstance(cmd, list)