fix: :bug: fix portfolio for empty watchlist

[jjfantini]

If a user selects a watchlist that is empty, no API is called and an overlay is shown prompting them to add Symbols to their watchlist and you also get a toast notification.

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Name	Status	Preview	Comments	Updated (UTC)
humblfinance-frontend	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 19, 2024 1:55pm

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