fix: make sure the initialization to throw an exception when there is no match url

[hottomato-c]

A minor checking added to network initialization.

Context

Found this when launching Uniswap interface locally and chose the Evmos chain.
The original error I got is :

So I looked into it a bit and seems we have a assumption that urls will not be empty which in fact it could be.

and 🤔 I reckon there is something we could do about it like :

• Exit early when conditions check fails
• Make sure the user of web3-react can capture this Unhandled Rejection with a more meaningful error name.

Plz let me know if this makes sense to you :D

Changes

• Add additional urls null check.
• Add unit test for the edge case.

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Name	Status	Preview	Updated
web3-react	✅ Ready (Inspect)	Visit Preview	Dec 5, 2022 at 6:40AM (UTC)