line: omit calculation of balance if credit/debit = None

remove unused imports

line.py

@@ -733,7 +733,12 @@ class Line(SecondCurrencyMixin, Workflow, ModelSQL, ModelView):
 
             lines = Line2.search(query)
             for line3 in lines:
-                balance += getattr(line3, credit_name) - getattr(line3, debit_name)
+                line_credit = getattr(line3, credit_name)
+                line_debit = getattr(line3, debit_name)
+
+                if (line_credit is not None) or (line_debit is not None):
+                    balance += line_credit - line_debit
+
                 if line3.id == line.id:
                     break
             return balance

view/line_list.xml

@@ -13,6 +13,5 @@ full copyright notices and license terms. -->
     <field name="debit" sum="Debit"/>
     <field name="balance"/>
     <field name="state"/>
-    <button name="wfedit"/>
     <button name="wfcheck"/>
 </tree>

wizard_booking.py

@@ -1,11 +1,10 @@
 # -*- coding: utf-8 -*-
-# This file is part of the cashbook-module from m-ds for Tryton.
+# This file is part of the cashbook-module from m-ds.de for Tryton.
 # The COPYRIGHT file at the top level of this repository contains the
 # full copyright notices and license terms.
 
 from trytond.model import ModelView, fields
 from trytond.wizard import Wizard, StateView, StateTransition, Button
-from trytond.i18n import gettext
 from trytond.pool import Pool
 from trytond.transaction import Transaction
 from trytond.pyson import Eval, Bool, If, And

wizard_booking.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0"?>
-<!-- This file is part of the cashbook-module from m-ds for Tryton.
+<!-- This file is part of the cashbook-module from m-ds.de for Tryton.
 The COPYRIGHT file at the top level of this repository contains the
 full copyright notices and license terms. -->
 <tryton>

wizard_openline.py

@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# This file is part of the cashbook-module from m-ds for Tryton.
+# This file is part of the cashbook-module from m-ds.de for Tryton.
 # The COPYRIGHT file at the top level of this repository contains the
 # full copyright notices and license terms.
 

wizard_openline.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0"?>
-<!-- This file is part of the cashbook-module from m-ds for Tryton.
+<!-- This file is part of the cashbook-module from m-ds.de for Tryton.
 The COPYRIGHT file at the top level of this repository contains the
 full copyright notices and license terms. -->
 <tryton>

wizard_runreport.py

@@ -1,12 +1,11 @@
 # -*- coding: utf-8 -*-
-# This file is part of the cashbook-module from m-ds for Tryton.
+# This file is part of the cashbook-module from m-ds.de for Tryton.
 # The COPYRIGHT file at the top level of this repository contains the
 # full copyright notices and license terms.
 
 from trytond.model import ModelView, fields
 from trytond.pyson import PYSONEncoder
-from trytond.wizard import Wizard, StateView, StateTransition, StateReport, Button
+from trytond.wizard import Wizard, StateView, StateReport, Button
-from trytond.i18n import gettext
 from trytond.pool import Pool
 from trytond.pyson import Eval, Bool
 from trytond.transaction import Transaction

wizard_runreport.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0"?>
-<!-- This file is part of the cashbook-module from m-ds for Tryton.
+<!-- This file is part of the cashbook-module from m-ds.de for Tryton.
 The COPYRIGHT file at the top level of this repository contains the
 full copyright notices and license terms. -->
 <tryton>