fix to python so that find usages no longer breaks when no usages are found
fix to python so that find usages no longer breaks when no usages are found

nosami/omnisharp-vim,AndBicScadMedia/omnisharp-vim,OmniSharp/omnisharp-vim,OmniSharp/omnisharp-vim,den-mentiei/omnisharp-vim,anurse/omnisharp-vim,OmniSharp/omnisharp-vim