Add new method for determining if Node is an ERROR
#114
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This new method `isError`, is complementary to `hasError`. The only difference is that it only checks if the current `Node` is the `ERROR`, whereas the other can determine if a `Node` has such descendants.
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This new method
isError, is complementary tohasError. The only difference is that it only checks if the currentNodeis theERROR, whereas the other can determine if aNodehas such descendants.