[Public user] Implement "No results" state

[overeha]

User Story
As a user, I want to be informed if my search on the map returned no results.

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Description
When I am searching in a place that returns no results, I want to receive a message (pop-up) that tells me that is the situations and instructs me on how to search better.

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Preconditions
N/A

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Main Flow

1. Perform a search
2. Search returns no results
3. Message is displayed in the center of the map in a pop-up saying "Ne pare rău, nu există rezultate. Încearcă să refaci căutarea pe o arie mai extinsă, să folosești alte cuvinte sau să elimini din criteriile de filtrare."
4. I can close the pop-up message and redo my search

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Business Requirements

• This behavior applies when there are no points in the database for that specific selection.
• When I close the message pop-up the window remains the same until I perform a new search
• If I perform a new search with a different selection and I do have results, but not in the current viewport, the map will zoom out to display at least one point matching the criteria I selected.