Return error if stream leader is undefined in stream manager (backport #14083) #14085
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A stream may not have a leader temporarily for several reasons, e.g. after it has been restarted. The stream manager may return undefined in this case. Some client code may crash because it expects a PID or an error, but not undefined.
This commit makes sure the leader PID is an actual Erlang PID and returns {error, not_available} if it is not.
References #13962
This is an automatic backport of pull request #14083 done by Mergify.