Handle potential null in extension lookup (#80621) #81740
+112
−8
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There are specific scenarios where applicability will remove a symbol from lookup entirely; no error, just silent removal. This introduces a
nullthat consumers were not expecting and caused an NRE. I've handled that NRE here and annotated the API. Fixes https://developercommunity.visualstudio.com/t/NRE-in-Roslyn-v500-225451107/10979295.(cherry picked from commit 16883a5)