tls_proxy null reference

[randombit]

In https://github.com/randombit/botan/actions/runs/10109511904/job/27957607585

     ERROR: Proxy said (stderr): /usr/include/c++/13/bits/stl_vector.h:1129:34: runtime error: reference binding to null pointer of type 'value_type'

I don't think this could be related to the change in that PR since we don't actually use pcurves for TLS yet

[reneme]

Perhaps related to the previous work on rectifying the tls_proxy concurrency state? (also here)