[FIX] l10n_fr_fec: no new line at the end of file

It seems that our beloved administration is not happy with the FEC file
ending with an empty new line

Hence, this commit makes the FEC file last line end without \r\n characters
and there is no empty new line

OPW 1943302

addons/l10n_fr_fec/wizard/account_fr_fec.py

@@ -109,6 +109,7 @@ class AccountFrFec(models.TransientModel):
             u'Idevise',        # 17
             ]
 
+        rows_to_write = [header]
         company = self.env.user.company_id
         if not company.vat:
             raise Warning(
@@ -117,10 +118,6 @@ class AccountFrFec(models.TransientModel):
             raise Warning(
                 _("FEC is for French companies only !"))
 
-        fecfile = io.BytesIO()
-        w = pycompat.csv_writer(fecfile, delimiter='|')
-        w.writerow(header)
-
         # INITIAL BALANCE
         unaffected_earnings_xml_ref = self.env.ref('account.data_unaffected_earnings')
         unaffected_earnings_line = True  # used to make sure that we add the unaffected earning initial balance only once
@@ -196,7 +193,8 @@ class AccountFrFec(models.TransientModel):
                     else:
                         listrow[11] = '0,00'
                         listrow[12] = str(-listrow_amount).replace('.', ',')
-            w.writerow(listrow)
+            rows_to_write.append(listrow)
+
         #if the unaffected earnings account wasn't in the selection yet: add it manually
         if (not unaffected_earnings_line
             and unaffected_earnings_results
@@ -207,7 +205,7 @@ class AccountFrFec(models.TransientModel):
             if unaffected_earnings_account:
                 unaffected_earnings_results[4] = unaffected_earnings_account.code
                 unaffected_earnings_results[5] = unaffected_earnings_account.name
-            w.writerow(unaffected_earnings_results)
+            rows_to_write.append(unaffected_earnings_results)
 
         # INITIAL BALANCE - receivable/payable
         sql_query = '''
@@ -265,7 +263,7 @@ class AccountFrFec(models.TransientModel):
         for row in self._cr.fetchall():
             listrow = list(row)
             account_id = listrow.pop()
-            w.writerow(listrow)
+            rows_to_write.append(listrow)
 
         # LINES
         sql_query = '''
@@ -330,20 +328,20 @@ class AccountFrFec(models.TransientModel):
             sql_query, (self.date_from, self.date_to, company.id))
 
         for row in self._cr.fetchall():
-            w.writerow(list(row))
+            rows_to_write.append(list(row))
 
+        fecvalue = self._csv_write_rows(rows_to_write)
         siren = company.vat[4:13]
         end_date = self.date_to.replace('-', '')
         suffix = ''
         if self.export_type == "nonofficial":
             suffix = '-NONOFFICIAL'
-        fecvalue = fecfile.getvalue()
+
         self.write({
             'fec_data': base64.encodestring(fecvalue),
             # Filename = <siren>FECYYYYMMDD where YYYMMDD is the closing date
             'filename': '%sFEC%s%s.csv' % (siren, end_date, suffix),
             })
-        fecfile.close()
 
         action = {
             'name': 'FEC',
@@ -352,3 +350,29 @@ class AccountFrFec(models.TransientModel):
             'target': 'self',
             }
         return action
+
+    def _csv_write_rows(self, rows, lineterminator=u'\r\n'):
+        """
+        Write FEC rows into a file
+        It seems that Bercy's bureaucracy is not too happy about the
+        empty new line at the End Of File.
+
+        @param {list(list)} rows: the list of rows. Each row is a list of strings
+        @param {unicode string} [optional] lineterminator: effective line terminator
+            Has nothing to do with the csv writer parameter
+            The last line written won't be terminated with it
+
+        @return the value of the file
+        """
+        fecfile = io.BytesIO()
+        writer = pycompat.csv_writer(fecfile, delimiter='|', lineterminator='')
+
+        rows_length = len(rows)
+        for i, row in enumerate(rows):
+            if not i == rows_length - 1:
+                row.append(lineterminator)
+            writer.writerow(row)
+
+        fecvalue = fecfile.getvalue()
+        fecfile.close()
+        return fecvalue