Fix useSelector calls for accessing non-existent exchangeRates

[Jon-edge]

CHANGELOG

Does this branch warrant an entry to the CHANGELOG?

• Yes
• No

Dependencies

none

Requirements

If you have made any visual changes to the GUI. Make sure you have:

• Tested on iOS device
• Tested on Android device
• Tested on small-screen device (iPod Touch)
• Tested on large-screen device (tablet)

---

• To see the specific tasks where the Asana app for GitHub is being used, see below:
  • https://app.asana.com/0/0/1209259612887729

[peachbits]

Approved, but change the changelog entry to note that we're now using a safe fallback 0 value for rates that don't exist. Internet connectivity isn't relevant to the bug