Disable the "No results" fake <option>.

In order to be more idiot-proof,
As a plugin,
I should disable the fake option indicating that there were no results.

:)

---

Good job on this plugin, saved me some time.

---

Also, I replaced `(No results.)` by `No results for "'+oldSearchText+'" filter.`, but it's a matter of taste so I'm not pushing that.