[FIX] account: avoid duplicated move name

Commits 9365482df0 and 8fc81b871d attempted to prevent the creation
of two moves with the same name during reconciliation. It works in most
cases, but it is still possible to reconcile the same statement line
with more than one line.

We add an extra check to make sure duplicate never happen.

opw-742018

addons/account/models/account_bank_statement.py

@@ -891,6 +891,10 @@ class AccountBankStatementLine(models.Model):
             # Create the move
             self.sequence = self.statement_id.line_ids.ids.index(self.id) + 1
             move_name = (self.statement_id.name or self.name) + "/" + str(self.sequence)
+            # Ensure no duplicate is created
+            if self.env['account.move'].search([('name', '=', move_name)]):
+                count = self.env['account.move'].search_count([('name', '=like', move_name + '/%')])
+                move_name = u'{}/{}'.format(move_name, count + 1)
             move_vals = self._prepare_reconciliation_move(move_name)
             move = self.env['account.move'].create(move_vals)
             counterpart_moves = (counterpart_moves | move)