Interrupted watch-ed transaction returns true instead of null

[gvko]

Scenario:

1. (client 1) Run watch on a key
2. (client 1) Set timeout of 10 sec for starting multi + modifying the key
3. (client 2) Modify key
4. (client 1) Exec the multi

Client 2 returns true, whereas it should return null, since the watched key has been modified from another client.
I tested the same scenario with redis and it works as expected. The problem is that I have to promisify it with Bluebird.

[moaxaca]

I will look at this thank you for the reproducible steps. 🍻