catch infura/metamask errors before they alert sentry #5113
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Description
We use a variety of techniques in our shared.js to determine whether the user has web3 access. One of the ways we do it is to attempt to access the coinbase of the connected ETH node - if the coinbase comes back as something other than undefined, then we assume we have a working blockchain connection. However, when calling this synchronous method in browsers that do not have metamask unlocked, we get an error trying to access the coinbase, and use this to show the user the "unlock metamask" alert. Each time this happens however, an alert is sent to sentry.
Refers/Fixes
This PR catches the error.
Testing
Untested