App Crashing without MetaMask Account

[kysley]

Expected Behavior

Step 1 should indicate error (or incomplete state) when MetaMask is closed when the user is prompted to login.

Current Behavior

Step 1 indicates success & app proceeds to crash once the user clicks 'Send to Bridge'

Possible Solution

(Quick Solution): Wrap the routes inside an ErrorBoundary Component which catches the crash and tells the user to reload.
(Better Solution): Include the above as a catch-all + check to make sure that we have access to MetaMask instead of assuming.

Steps to Reproduce

1. Open http://goerli.com/bridge
2. Close MetaMask popup (without logging in)
3. Enter any amount
4. Hit 'Send to Bridge'

Detailed Description

PR including both possible solutions + misc styling improvements.

Possible Implementation

See PR coming soon.

[chrisfenos]

seems to be the issue - MetaMask/metamask-extension#4434