DO NOT MERGE! Experiment stop files loading

[samholmes]

Review whether this satisifies the experiment requirements for the attached asana task

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• To see the specific tasks where the Asana app for GitHub is being used, see below:
  • https://app.asana.com/0/0/1208682348836559

[paullinator]

Needs to successfully pass blank tx files up to GUI

[swansontec]

This will probably work, but only "accidentally". This avoids doing an ls on the directory, but it doesn't actually disable loading the files themselves. That happens in loadTxFiles. Fortunately, without that initial ls, loadTxFiles just loops around uselessly and doesn't do anything. So, you've avoided most of the disk accesses, which means this would probably be OK for experimenting with.

To really be sure this works, I would go for the win and actually remove the call to loadTxFiles, which happens in $internalStreamTransactions. Then you know for sure we aren't loading any tx files from disk.

[swansontec]

You probably want to do changed.push(combinedTx) for every transaction, so the GUI still gets updates.

The idea here is to switch between onTxChanged / onNewTx, but since we don't have files, we just want everything to go in the "existing" bucket. The if (files[txidHash] != null) check was there to prevent crashes, but that's no longer needed thanks to your other changes.