Check if adapter is null and let it print errors

[Meai1]

I had entire sections in the package.json missing and the errors I was getting were not helpful at all, it just said "e.adapter.variables undefined". Well it's undefined because the adapter is null!
If we work around that null we can get actually helpful messages here.

[msftclas]

Hi @Meai1, I'm your friendly neighborhood Microsoft Pull Request Bot (You can call me MSBOT). Thanks for your contribution!

This seems like a small (but important) contribution, so no Contribution License Agreement is required at this point. Real humans will now evaluate your PR.

TTYL, MSBOT;

[isidorn]

@Meai1 thanks for the PR! Please squash your commits to be one and by our code style convention we do not use the var keyword, please use let instead.
Also did you build vscode off your changes and quickly verify that debugging works?

[Meai1]

i dont really know how git works, i just edited the file on github. I tested this by editing the unminified version of the workspace javascript file because I couldnt get the build to work, i made a separate issue for that. (#9961)

[isidorn]

Then please address my other concern that you are using var instead of let if you would like this PR to be merged. Then I can test it.

[isidorn]

Looks good to me, I merged it in.
Thanks 🍻