`eval`'s `options` argument should default to `{}`, even in the browser

lib/coffee-script/browser.js

@@ -7,6 +7,7 @@
   CoffeeScript.require = require;
 
   CoffeeScript["eval"] = function(code, options) {
+    if (options == null) options = {};
     if (options.bare == null) options.bare = true;
     return eval(CoffeeScript.compile(code, options));
   };

src/browser.coffee

@@ -4,7 +4,7 @@ CoffeeScript = require './coffee-script'
 CoffeeScript.require = require
 
 # Use standard JavaScript `eval` to eval code.
-CoffeeScript.eval = (code, options) ->
+CoffeeScript.eval = (code, options = {}) ->
   options.bare ?= on
   eval CoffeeScript.compile code, options