willconant/flow-js — pull request #7 by printercu (2013-01-16 19:01:16+00:00)
Title: anyError helper method

I wrote helper method to use with MULTI(). It just returns first error, `null` if there is no any.
Usage example:
```js
flow.exec(function() {
smth(MULTI());
smth2(MULTI());
}, function(results) {
var err;
err = flow.anyError(results);
if (err) {
return this(err);
}
// ....
});
```