Message when no items are matched

[blenderskool]

When the search term does not match any item, we can show a message informing the user that nothing was found instead of not showing anything.

Some points from design:

• color used for the text and icon is --gray-600 from the theme
• size of the text is 18px (use rems in code)
• size of the icon is 24px x 24px
• icon used is the frown icon