feat(vendor): add vendor opening balance dialog.

src/containers/Dialogs/CustomerOpeningBalanceDialog/CustomerOpeningBalanceForm.js

@@ -3,6 +3,7 @@ import moment from 'moment';
 import intl from 'react-intl-universal';
 import { Formik } from 'formik';
 import { Intent } from '@blueprintjs/core';
+import { defaultTo } from 'lodash';
 
 import { AppToaster } from 'components';
 import { CreateCustomerOpeningBalanceFormSchema } from './CustomerOpeningBalanceForm.schema';
@@ -35,6 +36,7 @@ function CustomerOpeningBalanceForm({
   const initialValues = {
     ...defaultInitialValues,
     ...customer,
+    opening_balance: defaultTo(customer.opening_balance, ''),
   };
 
   // Handles the form submit.