am-collapse bug with dropdown

[Duskfall]

data-animation="am-collapse" is not applied to the

elements of dropdown causing them to show instantly while the ul expands

[belfz]

The am-collapse css class is actually not being applied correctly to the element with bs-collapse-target attribute and it causes a bug. The bug still appears in angular-motion ver. 0.4.3 used with angular-strap ver. 2.3.6.