I am a bit confused by the behavior for the methods all() and one() if
the Query would return an empty result set. In the case of all() it
returns an empty list whereas one() will throw an exception
(sqlalchemy.exceptions.InvalidRequestError). I am sure there was a
reason to implement as it is now but wouldn't it be more convenient to
return simply None (or an empty String) and throw an exception only if
more than one row would be returned? An empty result set as such is
valid and shouldn't be treated as an error.
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