ember-sortable: Uncaught TypeError after 2.0.1 upgrade

Describe the bug Getting Uncaught TypeError after upgrading to 2.0.1.

To Reproduce Steps to reproduce the behavior:

1. Going to a page that has an ember-sortable component causes an Uncaught TypeError, and the page fails to load.

Expected behavior No errors

Screenshots

Additional context This is my template. Please advise if I’ve done something incorrectly. Just a FYI, filteredColumns could be an empty array.

      {{#sortable-group tagName='ul' model=filteredColumns class='column-list value editable' onChange=(action 'reorderColumns') as |group|}}
        {{#each group.model as |column|}}
          {{#group.item class='editable' model=column as |columnItem|}}
            {{#form-button class='remove-meta-key' defaultAction=(action 'removeFromColumns' column)}}
              {{x-icon name='subtract-circle-1'}}
            {{/form-button}}
            <span class='field'>{{column.field}}</span>
            <span title={{column.title}} class='title'>{{column.title}}</span>
            {{#columnItem.handle class='thumb'}}
              {{x-icon name='navigation-drawer-1'}}
            {{/columnItem.handle}}
          {{/group.item}}
        {{/each}}
      {{/sortable-group}}

I’m able to bypass the error if I modify sortable-item’s _tellGroup function like so:

  _tellGroup(method, ...args) {
    let group = this.get('group');

    if (group && group[method]) { // <-- add additional check
      group[method](...args);
    }
  },