.closest_vector() function is broken

[Max Alekseyev]

The following code in Sage 9.4 gives me KeyError?: ((None,), ()) followed by AttributeError?: 'sage.symbolic.expression.Expression' object has no attribute 'ceil':

from sage.modules.free_module_integer import IntegerLattice 

L = IntegerLattice([[-1, 0, 1],[1,0,2]])

L.closest_vector((1,1,1))

I see the same error on many other .closest_vector() calls - so essentially its functionality is broken at the moment. I've reported this as https://trac.sagemath.org/ticket/32486 but nobody seems to care.

Regards,

Max

[Dima Pasechnik]

fix proposed, needs review

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