node: fix panic in error cases, fix #2970 #3003
Merged
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internalErr has some buffer to accept multiple errors, but it only processes one of them, so if we have some cascading failures with multiple components reporting an error some of them will end up panicking because of closed channed. It's not very critical since the node is to die anyway, but it's nothing good either.
This particular case shouldn't really happen after #2996, but leaving this channel open is better than panic in case some other events lead to multiple sends to it.