Andrew Robert Nicols 344936ae48 MDL-37350 Detach listeners when hiding the 'Add roles' popup
If the submit event listener is not correctly closed, then the submit event
calls the relevant callback multiple times incorrectly.

When hiding the Add role dialogue, we need to detach any event listeners
which are applied to it.
2013-01-28 09:57:08 +00:00
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