Only make a elements activatable when they have an href attribute.

I've tested this manually, by clicking on the "baz" in code like

```js
var a = document.body.appendChild(document.createElement("a"));
a.textContent = "bar ";
a.setAttribute("href", "http://www.yahoo.com");
var b = a.appendChild(document.createElement("a"));
b.textContent = "baz";
```

Before this change, the click is trapped by `b` and ignored there; after this
change, the click passes through `b` to `a`, where it is handled.

Unfortunately, I haven't found a way to write an automated test.

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