[meld] Don't pass empty cwd to subprocess (closes bgo#597718)

[Kai Willadsen <kaiw src gnome org>]

commit aa9a506099627e1d62acbe6e7c09c217d86feef5
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Sun Oct 11 10:18:21 2009 +1000

    Don't pass empty cwd to subprocess (closes bgo#597718)

 meld/misc.py |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/meld/misc.py b/meld/misc.py
index a2cf71d..3a70e97 100644
--- a/meld/misc.py
+++ b/meld/misc.py
@@ -232,6 +232,8 @@ def read_pipe_iter(command, errorstream, yield_interval=0.1, workdir=None):
             if status:
                 errorstream.write("Exit code: %i\n" % status)
             yield "".join(bits)
+    if workdir == "":
+        workdir = None
     return sentinel()()
 
 def write_pipe(command, text):