Error handling

[Jbarget]

Imagine its just a running out of time thing but error handling here would be quite important

https://github.com/fac-13/crypt-os/blob/master/src/controllers/coin.js#L39

[helenzhou6]

And here too:

crypt-os/src/model/database/db_build.js

Line 14 in 8fdbafc

.catch(e => console.error('error: ', e));