invalid transaction: 0 output tx created, fails to broadcast about lbry-sdk HOT 4 OPEN

I've been looking at this, and it seems this could happen when the account is low on funds. Transaction code will try to add more UTXOs to cover the TX fee, but it might still produce this kind of transaction.

I've been writing a test that exposes this. I started with lots of small UTXOs. Small UTXOs tend to cause if change_amount > DUST to be false. The problem I'm encountering is that fixing this can lead to a very costly transaction requiring dozens of the small UTXOs. The cost of the TX can be many times the nominal value of the claim being abandoned.

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Thank you for digging in! I think it's pretty rare, must be some strange edge case. This particular user had hundreds of utxos.

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Question was raised at meeting -- Did lbrycrd allow transactions with no outputs?

Lbrycrd appears to disallow these:
https://github.com/lbryio/lbrycrd/blob/71fc94b1dea1c7818f84a09832ec3db736481e0f/src/consensus/tx_verify.cpp#L169

As does lbcd:
https://github.com/lbryio/lbcd/blob/master/blockchain/validate.go#L241

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No, it's an invalid tx and is not broadcast.

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