Only special case empty Hanzi Math results of subtraction #47
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Previously, operations like 我+你+我 would return results. This was because empty results of prior operations effectively reset the result, but we only want that with subtraction. 我+你+我 now returns [].
Note that this does not address self-adds, which are still broken. It also continues adding all parents in cases like: 我-我+我. The same transitivity is true for normal operations (so 力+口 returns many characters with 另 or 加 as a component, intentionally).