[PATCH] util: fix segfaults when config lacks a section

[fence]

Hi!

I ran into gnunets services just segfaulting sometimes.

I ran into the behaviour when running the transport service with the
transport.conf from the (meson) build output. (with an additional PEER 
section for the private key).

I think I had similar segfaults with other services too, but don't feel 
like trying to reproduce those tbh.

Was the NULL check missing due to performance or something?

Kind regards
fence

0001-util-fix-segfaults-when-config-lacks-a-section.patch
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