Tests fail with "Found something in the pcap file that either is non-IP, or cannot be parsed (RuntimeError)"

See e.g. https://jenkins.tails.boum.org/view/RM/job/test_Tails_ISO_stable/1829/cucumberTestReport/. I’ve not looked very closely but the first few test suite jobs I had to look at today exposed this problem.

@anonym, I had never seen it before, could this be related to the recent merge of feature/16148-unfiltered-pcaps?

Feature Branch: test/16788-fix-pcap-analysis

Original created by @intrigeri on 16788 (Redmine)

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