feat: search when no results there is too much top padding (#4530)

* add null check to collection floor price

* don't show 0 if floor is null

* remove top margin for no results

Co-authored-by: Charlie <charlie@uniswap.org>

src/components/NavBar/SearchBar.css.ts

@@ -149,6 +149,5 @@ export const notFoundContainer = style([
   sprinkles({
     paddingY: '4',
     paddingLeft: '16',
-    marginTop: '20',
   }),
 ])