fix: tests for anonymous functions on IE

[lucasfcosta]

This fixes tests for IE9 and above.
The problem was that IE was returning ' ' for anonymous functions and therefore it didn't match ''.
This also fixes errors regarding poorly-constructed errors, because ' ' would not evaluate to false and therefore we couldn't do getConstructorName(new errorLike()) and this would fail too.

Here we go 🎉

[meeber]

LGTM Professor @lucasfcosta

[coveralls]

Changes Unknown when pulling a219c3f on lucasfcosta:fix-anonymous-functions-ie into * on chaijs:master*.

[keithamus]

LGTM!

[lucasfcosta]

Build is passing the first time it was ran, the other builds have timed out since they received no output for 10 minutes.
You can see logs here, unfortunately I don't have permissions to restart the build.

The same thing happened last time we got this published, I think it may be an issue with running them all at the same time or some specific proxy settings, but I'd need more time to investigate it and find the real cause for this.
For now, would any of you mind restarting the build please?

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EDIT:
Just ran into this issue.
It may solve our problems. What do you guys think? Should I raise a PR for that? I'm not very confident it is stable and it will work, since the only way to test it is to merge and wait for the build to run successfully, but I can do it.

[meeber]

@lucasfcosta I'm not able to either

[keithamus]

I'm not sure why neither of you are able to restart the build - I've restarted it anyway.

The config we have here should be working - its the same config deep-eql has, and the same chai has I believe. It could be a case that we're hitting the limit of simultaneous VMs being run on that Saucelabs account.

At any rate while I've been typing this, it looks like the build has passed. check-error@1.0.1 has been released 😄.