exception when up/down-arrow key pressed with empty search (meta-k)

[phrohdoh]

On 1.0.0-beta57 (and reproduced on beta60 by @jsmorabito), opening the page create/search popup/view/? and pressing either the up- or down-arrow key without having entered anything will result in an exception.

https://github.com/athensresearch/athens/blob/v1.0.0-beta.60/src/cljs/athens/views/athena.cljs#L207-L230

I suspect we'll want to invoke scroll-into-view iff next-el is non-nil.

[phrohdoh]

I've shared a solution at https://discord.com/channels/708122962422792194/800439820190220339/821044549145198622 for review. This can of course become a PR if desired.

[jefftangx]

I suspect we'll want to invoke scroll-into-view iff next-el is non-nil.

Correct. Create a PR!