erp5_production_planning: set to 0 for not integer value

bt5/erp5_production_planning/SkinTemplateItem/portal_skins/erp5_production_planning/production_planning.js.js

@@ -110,7 +110,8 @@ function listenToInputChange(matrixbox_container) {
    td_index,
      sum_span,
      sum,
-     previous_value;
+     previous_value,
+     actual_value;
  $('td input').bind('input', null, function (e) {
    var input = $(this);
    if (input[0].getAttribute('value') != input[0].value) {
@@ -122,8 +123,9 @@ function listenToInputChange(matrixbox_container) {
    sum_span = sum_line.find('td:eq(' + (td_index) + ') span');
    sum = parseInt(sum_span.text());
    previous_value = input[0].getAttribute('data-previous-value') || input[0].getAttribute('value');
-   sum = sum + ((parseInt(input[0].value || 0)) - parseInt(previous_value));
-   input[0].setAttribute('data-previous-value', input[0].value || 0);
+   actual_value = parseInt(input[0].value) || 0;
+   sum = sum + (actual_value - parseInt(previous_value));
+   input[0].setAttribute('data-previous-value', actual_value);
    sum_span.text(format(sum));
  });
 }