Bugfix: masonry tried to remove unattached elements from DOM
Bugfix: masonry tried to remove unattached elements from DOM

In some cases React removes the elements from the DOM before masonry can do so, yielding an ugly error ("Cannot call method 'removeChild' of null"). Needed an extra-check to prevent that
eiriklv/react-masonry-mixin,StephenGrider/react-masonry-mixin,xsm-ue/react-masonry-mixin,meonam1712/react-masonry-mixin