Fixed the case where one of the alternative of an ambiguity is an emp… #2084
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Previously, when during error disambiguation one of the ambiguities consisted of an error tree with an empty "skipped" part (could only happen at the end of the file), that ambiguity was considered error-free. If there where other "regular" ambiguities in the ambiguity node, this node was not dropped as it should have been.
This PR fixes that.