MyTable.select(False).filter(False).count() crashes!

I get a weird error when I try to filter a selectResults object after
it is already empty.

It can be reproduced like this:

    >>> sr = MyTable.select(false) # obviously empty
    >>> sr.filter(False).count()
    TypeError: 'bool' object is unsubscriptable

This is a weird one.  I build a lot of dynamic queries and I don't
check as I add filters if I have an empty select results.

Is this a bug?  If so, I can try to fix.

Matt

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