Don't show empty tooltips

> In MUI this didn't show a tooltip if origin was missing:
> 
> https://explorer.dev.oasis.io/mainnet/sapphire/address/0x3cAbbe76Ea8B4e7a2c0a69812CBe671800379eC8
> <img width="640" height="376" alt="Image" src="https://github.com/user-attachments/assets/6e9b7ef1-f387-4385-827b-d9662304016e" /> 

 _Originally posted by @lukaw3d in [#2299](https://github.com/oasisprotocol/explorer/pull/2299/files#r2506039914)_

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Don't show empty tooltips #86

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Don't show empty tooltips #86

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