bug: cells, entries and the source chain not getting displayed on holochain `0.3`

[c12i]

@guillemcordoba I noticed that happs now scaffolded on 0.3 have the holochain-playground not displaying any cells, entries and the source chain like it would before.

This is the error logged in the dev tools console

77b620bf.js:6718 Uncaught (in promise) TypeError: t.filter is not a function
    at fhe (77b620bf.js:6718:615196)
    at The.<anonymous> (77b620bf.js:6718:623386)
    at Generator.next (<anonymous>)
    at a (77b620bf.js:6718:612255)

If you could point me to the direction where this issue is emerging, I could help fix it