Broadcasting not working with record array with a single record

This code:

``` python
    _p = np.empty(1, dtype=[('p', np.uint16), ('pr', np.uint16)])
    _p[:] = 1
```

Throws this exception:

``` text
TypeError: expected a readable buffer object
```

However this code works fine:

``` python
    _p = np.empty(2, dtype=[('p', np.uint16), ('pr', np.uint16)])
    _p[:] = 1
```

`_p.fill(1)` works in both cases.

This is with version `1.8.2`
