BUG: to_html misses truncation indicators (...) when index=False
When the html output is truncated (by using `mmax_rows=..`), you get `...` to indicate this, but not when using ``index=False``:

```python
df = pd.DataFrame(np.random.randn(5,2))
df.to_html(max_rows=4, index=False)
```

![screenshot from 2016-12-31 11-02-49](https://cloud.githubusercontent.com/assets/1020496/21576981/ecdd1b1a-cf48-11e6-85a9-a3cd50500cdc.png)


cc @TomAugspurger follow-up from #14999