Return empty block for empty parens instead of nil
Return empty block for empty parens instead of nil

gfvcastro/elixir,pedrosnk/elixir,ggcampinho/elixir,beedub/elixir,beedub/elixir,gfvcastro/elixir,joshprice/elixir,michalmuskala/elixir,lexmag/elixir,lexmag/elixir,antipax/elixir,ggcampinho/elixir,kimshrier/elixir,pedrosnk/elixir,kelvinst/elixir,kelvinst/elixir,antipax/elixir,kimshrier/elixir,elixir-lang/elixir