Fix 3845 nullptr cpp#3958

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parrt merged 2 commits intoantlr:devfrom

parrt:fix-3845-nullptr-cpp

Nov 14, 2022

Commits on Nov 14, 2022

Fixes #3845; C++ target was deref'ing nullptr when examining array of parent contexts, last one of which is nullptr.
parrt
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Drop a test that exposes another bug.
parrt
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