Hard crash when multiplying by empty matrix (process exits -1) about surge HOT 3 CLOSED

Added a precondition check.

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Thanks! But what do you think about returning an empty/zero matrix instead of treating it as an error? That seems less surprising mathematically, since empty matrices are valid objects. That's what e.g. numpy chooses to do:

>>> M = lambda r, c: np.random.rand(r, c)

>>> np.dot(M(1,2), M(2,0))
array([], shape=(1, 0), dtype=float64)

>>> np.dot(M(0,2), M(2,3))
array([], shape=(0, 3), dtype=float64)

>>> np.dot(M(1,0), M(0,3))
array([[0., 0., 0.]])

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Interesting, what about this: https://github.com/mattt/Surge/pull/93

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