[bug] Crash in HDRI sampling function

[Derpius]

Describe the bug
Indexing out of range into the pdf version of the hdri
This happens seemingly randomly

Screenshots

Additional context
The HDRI's PDFs have been somewhat broken recently, possibly as a result of the port to Clang

[Derpius]

Fixed in 432c45a
However this is most likely an issue with the underlying sampling strategy outputting garbage coordinates