rdflib.Graph.query: Constant False ASK query returns True

[lu-pl]

The following "Constant False" ASK query returns True:

from rdflib import Graph

graph = Graph()
result = graph.query("ask where {filter(false)}")

assert not result.askAnswer

filter(false) should effectively negate the possibility of a solution, so I would consider a result.askAnswer of True actually incorrect.

[lu-pl]

ask where {values () {}} raises a rather suspicious AttributeError: 'list' object has no attribute 'name'.