Enable capture and custom content handling of empty search results and search error

[mgrauer]

Let's say I have a custom search method, sometimes the search will return nothing and sometimes the search will be in error (say it is invalid according to my custom search method DSL).

I would like to

(1) be able to display custom content when there are no search results

and

(2) be able to display custom error content when my custom search handler returns an error (also which http error code should be sent back here, and can my custom search handler even control that?).

Apologies for issue scope sprawl.

[subdavis]

@mgrauer this looks like something you're still going to want. Is that correct?

[mgrauer]

yes please