causes errors\n  )\n```\n\nI'm imaging a function that could be called at the top of a function definition that would gobble this empty argument.  Or perhaps a wrapper function a la `Vectorize()` that could be used to convert any function into a function with this behavior.  Seems like this could be useful for many functions both within `dplyr` and elsewhere.\n</span>
<span class="co">#&gt; 4                                                                                                                     