Generated exception_names.jl doesnt work
Python
```py
    try:
        3 / 0
    except ZeroDivisionError:
        print("ZeroDivisionError")
```
successfully transpiles to
```julia
    try
        3 / 0
    catch exn
        if exn isa ZeroDivisionError
            println(join(["ZeroDivisionError"], " "))
        end
    end
```
But that doesnt detect the divide by zero.

This is a fairly high priority as it is the only case where pyjl transpiles successfully but the generated code isnt correct.