Fix NoneType error in tf.nn.depthwise_conv2d with unknown shape
Fix NoneType error in tf.nn.depthwise_conv2d with unknown shape

This fix tries to address the issue raised in 22110 where
tf.nn.depthwise_conv2d thowns out NoneType error when the input
shape is unknown.

This fix fixes 22110.

Signed-off-by: Yong Tang <765086fe2e0c1f980161f127fec596800f327f62@outlook.com>

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