Update model.js

[vitaly-t]

your example was broken in so many places... I tried to fix it, following the logic I saw there, but the last one cannot even be fixed, its a contradiction - you return nothing from the query, and trying to process the result...

[vitaly-t]

Also, returning things like:

return users.length ? users[0] : false;

is generally a bad idea.

[vitaly-t]

Missed one thing, the last:

yield pg.none

should also become

yield db.none

[ruimarinho]

Thanks for the PR! I'll take a look at it during the weekend.