Avoid negative count values

[Sergio-Muriel]

Sometimes "somehow", i got negative count values calling https://theoldreader.com/reader/api/0/unread-count?all=true&output=json

The results received is:

• http://pastebin.com/t7xPBmgF

Expected value:

• no negative values, should be "count" : 0

[krasnoukhov]

Well, that's not cool. Maybe @jfiorato could help?

[jfiorato]

Yep, I'll take a look. We've seen it on the site too, just been unable to reproduce so far. I'll see what I can find.