Some sequence shards have missing fields

[smauq]

When going over the sequence shards, some of them have missing fields. The loading being done as it's described in the example script, the code crashes with the following error message

InvalidArgumentError: Name: <unknown>, Feature list 'image/encoded' is required but could not be found.  Did you mean to include it in feature_list_dense_missing_assumed_empty or feature_list_dense_defaults?
	 [[{{node ParseSingleSequenceExample/ParseSequenceExample/ParseSequenceExampleV2}}]]

And the faulty shards I found by iterating over the entire dataset are (the missing fields differ between the affected shards):

objectron/sequences/book/book_train-00020-of-01324
objectron/sequences/book/book_train-00476-of-01324
objectron/sequences/book/book_train-01231-of-01324
objectron/sequences/book/book_train-01256-of-01324
objectron/sequences/bottle/bottle_train-00559-of-01320
objectron/sequences/chair/chair_train-00365-of-01274

[ahmadyan]

I'll look into this.