[Feature] display a message when no resources are found matching the filters

## Problem
When a user selects various filters from `topic`, `medium` and `language`, there is a possibility that none of the resource match the selected combination of filters. In this case, the user can get confused as nothing shows up on the screen.

## Description

A text message should show up. which describes that no resources matched to the selected filters so the user knows it is not a problem in his machine that nothing is showing up.

## Additional context
For example, this combination of filters: [a website about licenses in arabic language](https://resources.creativecommons.org/all/?&topic=licenses&medium=website&language=ar)

## Implementation

- [x] I would be interested in implementing this feature.

Start from the filtered resource listing shown by the example URL and trace how the topic, medium, and language filters produce the visible results. Reproduce a combination with no matches, then make the listing display a clear no-resources message instead of appearing empty.

Written by the indexing model from the issue text.