Fix: Clean out sample search error message when initiating new search

[mbaudis]

Maybe only a problem during development, but error messages in search are persistent until the next response comes in; should be cleared when hitting the search button.

[ptoussai]

Could you give me the steps to reproduce this issue?

[mbaudis]

This was when getting an error from the API -> yellow box -> new search parameters w/ long load time -> yellow box persisted until (now correct) result came in.