fix script constructor array check

test/script.js

@@ -7,11 +7,12 @@ describe('Script', function() {
       assert.ok(new Script([]))
     })
 
+    it('works when nothing is passed in', function() {
+      assert.ok(new Script())
+    })
+
     it('throws an error when input is not an array', function() {
-      assert.throws(function(){
-        new Script({})
-      })
+      assert.throws(function(){ new Script({}) })
     })
   })
-
 })