[PATCH] largefiles: don't query the dirstate for key None

[Siddharth Agarwal]

# HG changeset patch
# User Siddharth Agarwal <sid0 at fb.com>
# Date 1363726174 25200
#      Tue Mar 19 13:49:34 2013 -0700
# Node ID 19731e3cad1ae91d96da4a49994e94ab3b157850
# Parent  e501e6c715b1c2a12ef151d4811b04afdb483527
largefiles: don't query the dirstate for key None

lfutil.splitstandin(f) can be None, and we query the dirstate for that without
checking if it is. This will cause problems with the upcoming move to critbit-
based dicts, since they only support strings as keys.

diff --git a/hgext/largefiles/overrides.py b/hgext/largefiles/overrides.py
--- a/hgext/largefiles/overrides.py
+++ b/hgext/largefiles/overrides.py
@@ -373,10 +373,13 @@ def overridemanifestmerge(origfn, repo, 
         f, m, args, msg = action
 
         choices = (_('&Largefile'), _('&Normal file'))
-        if m == "g" and lfutil.splitstandin(f) in p1 and f in p2:
+
+        splitstandin = lfutil.splitstandin(f)
+        if (m == "g" and splitstandin is not None and
+            splitstandin in p1 and f in p2):
             # Case 1: normal file in the working copy, largefile in
             # the second parent
-            lfile = lfutil.splitstandin(f)
+            lfile = splitstandin
             standin = f
             msg = _('%s has been turned into a largefile\n'
                     'use (l)argefile or keep as (n)ormal file?') % lfile