Problem when no scroll because there are few elements and aboveSize

[ccanado]

Under circumstances mentioned in the title, when _resetIndex is executed, a call to setScrollTop is made

(1268)
this._scrollTop = this.setScrollTop(this._aboveSize + (index / this._rowFactor) * this._physicalAverage);

At this moment this._scrollTop has to be set with a at least aboveSize.

(520)

this.setScrollTop = function(val) {
    target.scrollTop = val;
    return target.scrollTop;
};

but after target.scrollTop = 48; (for example)
target.scrollTop still value 0 since there is no scroll (no scroll because there are few elements).
So when the function return target.scrollTop, returns 0 instead of returning 48.

It would be needed to check first if target.scrollTop can be set or not