fix(core): Check when source childList is emptied
fix(core): Check when source childList is emptied

Quick fix to check when a `source` child list has been emptied

videogular/videogular2,videogular/videogular2,kwarismian/videogular2,videogular/videogular2,amitkumarmahajan/videogular2,amitkumarmahajan/videogular2,kwarismian/videogular2,kwarismian/videogular2,amitkumarmahajan/videogular2