Indentation of first data constructor does not work with haskell-indent

Say I am declaring a data type:

``` haskell
data FooX
```

where `X` is the cursor position. Pressing enter does not indent the new line, but I would expect there to be some indentation:

``` haskell
data Foo
X
```

Now I define a data constructor:

``` haskell
data Foo
= BarX
```

In this setting pressing tab does not indent the code. #1079 might be related.
