Add extra guards against grammar, fixes #451
Add extra guards against grammar, fixes #451

RichiCoder1/omnisharp-atom,RichiCoder1/omnisharp-atom,tmunro/omnisharp-atom,rambocoder/omnisharp-atom,OmniSharp/omnisharp-atom,tmunro/omnisharp-atom,RichiCoder1/omnisharp-atom,OmniSharp/omnisharp-atom,tmunro/omnisharp-atom,OmniSharp/omnisharp-atom,rambocoder/omnisharp-atom,tmunro/omnisharp-atom,RichiCoder1/omnisharp-atom,rambocoder/omnisharp-atom