dat unpublish fails with SyntaxError: Unexpected end of JSON input

[CristianCantoro]

(I am coming from dat-ecosystem-archive/datBase#637)

I am reporting:

• a bug or unexpected behavior

Please give us details about your installation to assist you. Run dat -v to see the version of Dat you are using.

• Operating system:
• Node Version:
• Dat Version:

Expected behavior

dat unpublish unpublishes the dat.

Actual behavior

The program crashes with an error.

$ dat unpublish
SyntaxError: Unexpected end of JSON input
    at JSON.parse (<anonymous>)
    at /home/cconsonni/.dotfiles/nvm/.nvm/versions/node/v10.14.0/lib/node_modules/dat/node_modules/toiletdb/index.js:73:29
    at /home/cconsonni/.dotfiles/nvm/.nvm/versions/node/v10.14.0/lib/node_modules/dat/node_modules/hyperdrive/index.js:537:5
    at f (/home/cconsonni/.dotfiles/nvm/.nvm/versions/node/v10.14.0/lib/node_modules/dat/node_modules/once/once.js:25:25)
    at Class.<anonymous> (/home/cconsonni/.dotfiles/nvm/.nvm/versions/node/v10.14.0/lib/node_modules/dat/node_modules/stream-collector/index.js:15:5)
    at Class.emit (events.js:187:15)
    at endReadableNT (/home/cconsonni/.dotfiles/nvm/.nvm/versions/node/v10.14.0/lib/node_modules/dat/node_modules/readable-stream/lib/_stream_readable.js:1010:12)
    at process._tickCallback (internal/process/next_tick.js:63:19)

Debug Logs

$ DEBUG=dat* dat unpublish
  dat Dat DEBUG mode engaged, enabling quiet mode +0ms
  dat dat 13.11.4 +18ms
  dat node v10.14.0 +1ms
  dat-node archive ready. version: 1446 +0ms
SyntaxError: Unexpected end of JSON input
    at JSON.parse (<anonymous>)
    at /home/cconsonni/.dotfiles/nvm/.nvm/versions/node/v10.14.0/lib/node_modules/dat/node_modules/toiletdb/index.js:73:29
    at /home/cconsonni/.dotfiles/nvm/.nvm/versions/node/v10.14.0/lib/node_modules/dat/node_modules/hyperdrive/index.js:537:5
    at f (/home/cconsonni/.dotfiles/nvm/.nvm/versions/node/v10.14.0/lib/node_modules/dat/node_modules/once/once.js:25:25)
    at Class.<anonymous> (/home/cconsonni/.dotfiles/nvm/.nvm/versions/node/v10.14.0/lib/node_modules/dat/node_modules/stream-collector/index.js:15:5)
    at Class.emit (events.js:187:15)
    at endReadableNT (/home/cconsonni/.dotfiles/nvm/.nvm/versions/node/v10.14.0/lib/node_modules/dat/node_modules/readable-stream/lib/_stream_readable.js:1010:12)
    at process._tickCallback (internal/process/next_tick.js:63:19)

Seeing this bug "pretty-printed json fails to parse w/ dat --json" (#37), I have compacted my dat.json, but the error persists.