multi-lookup: removing item results in two calls to "removeOptionTile", causes error

[pauljrooney]

When removing an item from a multi-lookup list, the "removeOptionTile" function is called twice (once explicitly and another time through the value change event handler). The function succeeds the first time (removing the item from the list) but fails the second time with an error due to the fact that the item no longer exists at the index in the array:

Action failed: c:strike_multiLookup$controller$handleComponentDestroyed [undefined is not an object (evaluating 'm[m.length+a].rawIndex')]
Failing descriptor: {c:strike_multiLookup$controller$handleComponentDestroyed}

The error occurs on line 320 in strike_multiLookupHelper.js:

currentOptionTiles.splice(destroyedIndex, 1);

On the second invocation of this method, destroyedIndex is undefined, which causes the error.