Fixed SEGV when users pass nil messages. This also disallows nil in RepeatedField or Map.
#8363
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acozzette
approved these changes
Mar 2, 2021
This was referenced Mar 7, 2021
This was referenced Mar 14, 2021
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We cannot have nil messages in repeated fields or maps, it is semantically undefined what it would mean to serialize that. It is a bug that nil messages were ever allowed.
Fixes: #8359