Commits on Oct 3, 2018

1. [CBR-462] Fix fee estimation when transaction's amount matches accoun… …

   …t's balance
   
   When calling
   
   ```
   reduceChangeOutputs
     :: forall dom. CoinSelDom dom
     => Fee dom
     -> [Value dom]
     -> ([Value dom], Fee dom)
   ```
   
   If the `[Value dom]` is a singleton array with a zero coin, we're going
   to end up dividing by zero and silently obliterating fee as we do it.
   This happens when making a transaction with no change, i.e., when the
   transaction's amount matches exactly the source account's balance.
   
   This commit provides a fix handling this special edge-case.

   

   KtorZ committed Oct 3, 2018
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2. [CBR-462] Throws right error when running out of UTxO in fee calculation …

   In this context, @CoinSelHardErrUtxoDepleted@ might be thrown by
   `pickUtxo` as we iterate over the selected change outputs which here
   means that we are running out of UTxOs to cover the fee.  Hence, we
   ought to remap the error accordingly to @CoinSelHardErrCannotCoverFee@.

   

   KtorZ committed Oct 3, 2018
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