[R] non-terminal token lacking children from utils::getParseData

[B Tyner]

Hi,

I have run across a source file for which the return value
of getParseData() includes a record having FALSE for $terminal, yet it is
not the parent of any other tokens. Before I spend time constructing a
reproducible example, I wanted to verify that this is in fact unexpected
behavior (under R 3.1.2)?

Thanks,
Ben

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