Openff-toolkit: Update __init__ file to not raise exception

[bannanc]

I apologize if this is a duplicate of something you already have documented @j-wags. The main __init__ file in openforcefield looks like it still raises an exception if OpenEye toolkits aren't installed. It also has a few commented out lines at the bottom that seem like they should be uncommented or removed.

[andrrizzi]

Thanks for catching this! It's weird that our tests don't catch this. I'll take a look at this today, and schedule it for the upcoming milestone as I think this is critical.

[j-wags]

Sorry to be late to this party. I just checked out @andrrizzi's PR #280 . I agree with him that this exception was getting caught by try/except logic before, but it did result in us double printing the "you didn't install the OpenEye Toolkit" message.

Looking into this also revealed a potential error with our build system (which is I think what @bannanc wanted to chat about tomorrow in Irvine).

Thanks for posting this issue. I didn't even realize that the top-level __init__ had any logic in it before.

Agree that merging #280 should close this.