Cannot unassign post from a category

[tuxpiper]

Expected behaviour

1. Given a post assigned to category C1; if I edit the post, remove the assignation to C1 and save, the post should not be assigned to any categories.
2. Given a post assigned to category C1, if I edit the post, and remove the assignation to C1 and assign to category C2, the post should be assigned to category C2 only

Actual behaviour

1. The post remains assigned to category C1
2. The post becomes assigned to category C1 and C2

Steps to reproduce the behaviour/error

Directly reproducible from the behavior description

[rjmackay]

@jshorland Q on process: this is clearly a bug.. I don't think sizing a bug like this is particularly useful.
Should I drop it straight into Waiting for sprint? or waiting for dev?

[jshorland]

Let's drop this straight into waiting for dev, I'd say

Sent from my iPhone

On Sep 19, 2016, at 5:56 PM, Robbie Mackay notifications@github.com wrote:

@jshorland Q on process: this is clearly a bug.. I don't think sizing a bug like this is particularly useful.
Should I drop it straight into Waiting for sprint? or waiting for dev?

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[jshorland]

works like a dream. Passes QA.

[tuxpiper]

Thank you! Applied the fix to the 1000ocean.ushahidi.com deployment.

@Celestine22