fix MutableLinkedList when appending empty list #915
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Currently
append!(MutableLinkedList{Int}(1), MutableLinkedList{Int}())results in an infinite iteration. This is due to the order of sentinel-node reassignments and the second list being empty. One way to fix that is by using something likeisempty(l2) && return l1at the top of theappend!method. Another (proposed in this PR) is to just reorder the reassignments. The former is more straightforward, the latter adds no new code.