Enhance home page of `Price lists` app

[pfferrari]

What I did

Enhanced home page of Price lists app by:

• fixing a copy error in a search bar placeholder
• hiding the search bar if no price lists are available
• hiding also the whole Browse section if no price lists are available and showing the old gray empty state inviting the user to create his/her first price list

Checklist

• [x] Make sure your changes are tested (stories and/or unit, integration, or end-to-end tests).
• [ ] Make sure to add/update documentation regarding your changes.
• [x] You are NOT deprecating/removing a feature.

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