Empty sortable group

[mrosenberg]

If you don't prefill the sortable group array with at least one item, no drop zone is created. This prohibits adding any items to the sortable group array.

[mrosenberg]

I was able to get around the issue by checking for array length and using a dummy sortable item.

          {{#sortable-group
            tagName="div"
            model=modules
            onChange="update"
            onInsert="insert"
            onSortStart="sortstart"
            onSortEnd="sortend"
            as |group|
          }}

            {{#unless modules.length}}

              {{#sortable-item
                group=group
              }}

                <p>Drag here to start building your report.</p>

              {{/sortable-item}}

            {{else}}

              {{#each modules as |module|}}

.....