Count on initial grid with no items

Total Items shown in the footer for an empty grid is 1, when it should be 0 (zero) since, well, it's empty.

I believe this can be fixed at line 1556 via the following:

```
return self.config.pagingOptions.totalServerItems() || self.sortedData().length || 0;
```

instead of using:

```
return self.MaxRows();
```

Start at line 1556, where the footer's Total Items value is calculated, and compare the current MaxRows() result with the proposed empty-grid behavior. Verify that an empty grid displays 0 while the count remains correct when items or server totals are present.

Written by the indexing model from the issue text.