Count is the number of non-null elements

Fixes https://github.com/ContinuumIO/blaze/issues/443 
Fixed.

On Fri, Oct 10, 2014 at 9:43 AM, Phillip Cloud <notifications@github.com>
wrote:

> In blaze/compute/tests/test_numpy_compute.py:
>
> > @@ -91,6 +91,12 @@ def test_Reductions():
> >      assert compute((t['amount'] > 250).all(), x) == False
> >
> >
> > +def test_count_nan():
> > +    t = TableSymbol('t', '3 * ?real')
>
> should this be Symbol?
>
> —
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> <https://github.com/ContinuumIO/blaze/pull/728/files#r18716391>.
>