[P2 FEATURE] Add error string when search doesn't find any results

[gregwoo-microsoft]

There should be an error message when the search query doesn't yield any results

[Pinguin2001]

I can work on this, is a ContentDialog fine, or should a InfoBar be displayed instead?

[nmetulev]

Thanks @Pinguin2001. @niels9001, what do you think about how to display this error message?

[niels9001]

A TextBlock with message in the results pane would suffice?

[Pinguin2001]

Id say either a simple TextBlock or InfoBar

[pealmasa]

Not sure if this was understood, but it seems the issue is more "deep" than simply a model not found in search and add a text block or infobar.

See: #75

[niels9001]

Closed by #116