Don't attempt to get a non-existent field (#426)
Don't attempt to get a non-existent field (#426)

I thought this was ok, because the error would get propagated, but pyjulia
doesn't have a toplevel error handler for various things, causing problems here.
Instead, try to fall back to the generic python method for missing fields.

Fixes https://github.com/JuliaPy/pyjulia/issues/116
JuliaPy/PyCall.jl