Handle test failures with no message

[mrsimo]

/cc @harvesthq/ep and @pusewicz @maria-faulisi @braddunbar who encountered these

In this build (and others) it seems like there's a new type of test failure that produce a junit file a bit different from what we've seen until now. The culprit is this error element that looks like:

<error type='OpenSSL::Cipher::CipherError' message="">

The code expected the message to always be present, it seems. I've made it fallback to use the type when there's no message. This repo is already a fork of the original plugin, because it didn't show things the way we liked (back in the day), I'm not planning to look much further than this :P

[mrsimo]

We have no CI for this repo, which is a bit funny. Locally they pass:

❯ ruby ruby/tests/annotate_test.rb
Run options: --seed 23438

# Running:

..

Finished in 0.285979s, 6.9935 runs/s, 13.9870 assertions/s.
2 runs, 4 assertions, 0 failures, 0 errors, 0 skips

[mrsimo]

Gonna go ahead and figure out how to release this