message: Remove unnecessary default case handling
diff: @@ -1707,13 +1707,6 @@ def assert_shapes(shapes, event_shape_only=False, data=None, summarize=None,
  size = actual_sizes[tensor_dim]
  size_specifications[size_symbol] = (size, x, tensor_dim)
  - if not rank_assertions:
  - rank_assertions = \
  - [control_flow_ops.no_op(name='static_checks_determined_all_ok')]
  - if not size_assertions:
  - size_assertions = \
  - [control_flow_ops.no_op(name='static_checks_determined_all_ok')]
  -
  with ops.control_dependencies(rank_assertions):
  shapes_assertion = control_flow_ops.group(size_assertions)
  return shapes_assertion
  