Checks if stack trace exists when logging errors

[toolbuilder]

Thanks for writing this and esm-tape-runner. I use zora as a TAP producing test library instead of tape. Zora does not produce a stack trace when there is an error, so tap-monkey crashes. Here's my fix. I tested the pack file on my project. I also used rollup to create a CommonJS version of the project and tested with tape as the test runner. The tests were still zora, except one I converted to tape.

BTW, I've since found that pta is also an ES and CommonJS test runner that meets your requirements. Pta is the npm package name.