Dragging and dropping rooms broke the room list

[turt2live]

RoomListActions.js:74 Uncaught TypeError: Cannot read property 'roomId' of null
    at RoomListActions.js:74
    at actionCreators.js:51
    at MatrixDispatcher.dispatch (dispatcher.js:36)
    at Object._onRoomTileEndDrag (LoggedInView.js:314)
    at Object._onDragEnd (LoggedInView.js:299)
    at exports.default (fire-hooks.js:71)
    at drag-drop-context.js:137
    at dispatch (createStore.js:186)
    at index.js:14
    at dispatch (applyMiddleware.js:45)
    at action-creators.js:316
    at index.js:11
    at Object.dropAnimationFinished (bindActionCreators.js:7)
    at Draggable._this.onMoveEnd (draggable.js:100)
    at moveable.js:89

riot.im/develop windows 10, chrome

[turt2live]

I think this has to do with racing the requests to set account data

[turt2live]

Closing in favour of #8614