Fix error not being reported properly

[jessie-ross]

This PR fixes a gap in errors being reported.
Related to #256

I haven't looked at the whole code context so I am not sure if this is the best way to do so - let me know.

Replicating the issue:

1. Create new deps.edn project.
2. Add a file with a dash in it's name instead of an underscore (which every beginner is going to do 😭 ).
3. Try to evaluate something in that file's context.
4. See the same error as in Every clojure exception shows E716: Key not present in Dictionary #256

[tpope]

Can you share the full error output? E716 is pretty generic; I wouldn't jump to the conclusion that it's the same root cause as that 5 year old issue.

state.err in this context is stderr. Its presence does not necessarily warrant an exception.

[jessie-ross]

Can you share the full error output?

Sure!

With the error occuring on this line.

And this is what I see with the fix:

[jessie-ross]

state.err in this context is stderr. Its presence does not necessarily warrant an exception.

I am checking msg.err here, not sure if that is different, also msg.ex is set to an exception class if we want to branch on that.

[tpope]

I meant to say msg.err.

What are the full contents of msg.err? You can use let err = 'Clojure: ' . json_encode(msg) to check.