(Hopefully) temporary hack to detect null chars in node_ids in the nodes table.
This is completely reactive and based on no reasoning. A common case of the somebodys-been-messin-with-my-memory bug, is that we start seeing node_ids with null chars at the end. Here we will send a stack trace to testbed-ops if this happens (and we strip off the null). I am hoping to narrow down where this happens.
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