Fix a mistaken assertion that only succeeds by accident. #7960
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Specifically, it succeeds because we get a pointer to the first of a block of
elements where the size of the block is greater than one. If one had a 1-point
quadrature formula, the assertion would fail.
See also the discussion in https://github.com/dealii/dealii/pull/6747/files#r277197764
as part of #6747.