BUG: Treat a list/ndarray identically for iloc indexing with list-like (GH5006)
Merge pull request #5134 from jreback/list_index

BUG: Treat a list/ndarray identically for iloc indexing with list-like (GH5006)
BUG: Fix segfault on isnull(MultiIndex)

Now raises NotImplementedError b/c not yet clear what it should return.