Crash in PRMan render delegate

[lanierd-adsk]

Hi,

When using PRMan as a render delegate in maya hydra, I often get a crash in :

riley::Riley * const riley = AcquireRiley();
riley->SetOptions(prunedOptions);

Where riley is a nullptr.
This is from

OpenUSD/third_party/renderman/plugin/hdPrman/renderParam.cpp

Line 3369 in 0c7c52b

riley::Riley * const riley = AcquireRiley();

Thank you.

[sunyab]

Filed as internal issue #USD-11841

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