message: Updated: cell value
diff: import contains from 'mout/array/contains';
  +import isNull from 'mout/lang/isNull';
  import { constants as actions } from '../../../store/actions';
  import '../../atoms/viron-prettyprint/index.tag';
  @@ -17,10 +18,14 @@ export default function() {
  break;
  case 'number':
  case 'integer':
  + if (isNull(this.opts.data.cell)) {
  + this.value = '';
  + } else {
  this.value = String(this.opts.data.cell);
  + }
  break;
  case 'string': {
  - this.value = this.opts.data.cell || '-';
  + this.value = this.opts.data.cell || '';
  const split = this.value.split('.');
  if (!!split.length && contains(['jpg', 'png', 'gif'], split[split.length - 1])) {
  this.isImage = true;
  