Handle the case when we can't generate descriptors
Relays that fail to generate a server descriptor or extra-info descriptor also fail to generate a server descriptor. They just print out a warning and retry a couple of milliseconds later.
rransom wrote a patch in his mitigate2183 branch that at least generates a server descriptor in case we cannot generate an extra-info descriptor.
Sebastian mentioned that failing may also be an option if we can't generate an extra-info descriptor, or we'll never learn about this bug.
We should decide what the best behavior in this case is and write a patch.
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