From 46d244b061ad1d27519f44efa1f89988ea1cf9cd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Krier?= <ced@b2ck.com>
Date: Fri, 8 Apr 2016 22:54:24 +0200
Subject: [PATCH] Test if there is something to write before calling write

ModelStorage.write requires at least a tuple of records, values.

issue5456
review21921002
---
 statement.py                         | 3 ++-
 tests/scenario_account_statement.rst | 6 ++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/statement.py b/statement.py
index 5f1037def0..e3cff25c5e 100644
--- a/statement.py
+++ b/statement.py
@@ -431,7 +431,8 @@ class Statement(Workflow, ModelSQL, ModelView):
             to_write.append({
                     'move': move.id,
                     })
-        Line.write(*to_write)
+        if to_write:
+            Line.write(*to_write)
 
         move_lines = []
         for move, statement, lines in moves:
diff --git a/tests/scenario_account_statement.rst b/tests/scenario_account_statement.rst
index 82702d30b7..311265dd58 100644
--- a/tests/scenario_account_statement.rst
+++ b/tests/scenario_account_statement.rst
@@ -430,3 +430,9 @@ Test number of lines validation::
     >>> second_line.account = receivable
     >>> second_line.party = customer
     >>> statement.click('validate_statement')
+
+Validate empty statement::
+
+    >>> statement = Statement(name='empty', journal=statement_journal)
+    >>> statement.end_balance = statement.start_balance
+    >>> statement.click('validate_statement')