Don't show the clear search icon when the entry is empty

[danirabbit]

When there is no text, it's a button that does nothing. We should get rid of it when the entry is empty

[benwaffle]

I think you can do this in CSS with <input pattern=".+" /> and input:valid { ... }

[flobrosch]

We should use the pattern to handle non-ID-characters instead.

[SkyzohKey]

Note that pattern isn't working on old browsers