From e0493cd6d4cb7a99e3922308bb99cec62dc760af Mon Sep 17 00:00:00 2001
From: Xavier Morel <xmo@openerp.com>
Date: Tue, 15 Oct 2013 12:03:13 +0200
Subject: [PATCH] [FIX] handling of single-line files sent for preview

bzr revid: xmo@openerp.com-20131015100313-sdgqx1t43922kgq8
---
 addons/base_import/models.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/addons/base_import/models.py b/addons/base_import/models.py
index 996dbf7964d..f49db56e755 100644
--- a/addons/base_import/models.py
+++ b/addons/base_import/models.py
@@ -224,12 +224,13 @@ class ir_import(orm.TransientModel):
             headers, matches = self._match_headers(rows, fields, options)
             # Match should have consumed the first row (iif headers), get
             # the ``count`` next rows for preview
-            preview = itertools.islice(rows, count)
+            preview = list(itertools.islice(rows, count))
+            assert preview, "CSV file seems to have no content"
             return {
                 'fields': fields,
                 'matches': matches or False,
                 'headers': headers or False,
-                'preview': list(preview),
+                'preview': preview,
             }
         except Exception, e:
             # Due to lazy generators, UnicodeDecodeError (for