Finalize uniswap-widget

[L03TJ3]

Description
we wanted to have an MVP up because liquidity as being moved already
some left-over todo's are:

• - add analytics
• - fix logo's missing when using custom-token list: Using custom token-lists breaks loading default logo's Uniswap/widgets#602
• - add error handling

[vldkhh]

@L03TJ3 still reproduces on dev

Also 'null' errors appear

[sirpy]

@vldkhh the lockdown-install is not related to us, it must be some extension you have
@L03TJ3 i think we might need to fix the Logo link from the list we use, verify that Celo logo link in the list is working

[L03TJ3]

@sirpy The link is fine
its just caused by this issue: Uniswap/widgets#602

[sirpy]

@L03TJ3 the issue you opened on uniswap doesnt describe what causes it only that it happens.
when I look at the console logs you supplied i see a lot of fetching of "pngs" returned with 404 which means it wasnt able to fetch the logos.

[L03TJ3]

I don't know what causes it... All I know is so far is that when using a custom list:

1. the DEFAULT native token logo suddenly stops working
2. adding the native token to the list, have it show up twice but the link still sometimes works/doesnt work

I have not gone over the full list yet to see which png are loading up or not

[L03TJ3]

@decentralauren when considering re-enabling the swap we should re-test current handling of errors / transactions failed etc.

The logo issue is opened a year ago, 0 response. don't think that will be fixed (by them)
@vldkhh maybe for you to re-test (fuse/celo widgets)

[decentralauren]

@vldkhh can you get with Lewis on what needs to be tested so that we can include this work as part of relaunching Swap next week?

[decentralauren]

Fine to not display currency logo as issue is unresolved on Uniswap's side.

[vldkhh]

verified on dev

[vldkhh]

verified on prod