No error message shown on scanning invalid QR

[wesinator]

First off, thank you for this app! The Category feature is awesome and I haven't seen it implemented anywhere else.

Was trying to scan a QR code that I found out was invalid/unsupported (MS authenticator), and I noticed it spin for a while and didn't give an error message saying the code was invalid.

To reproduce:

• Scan invalid QR

Expected: error message showing QR is not valid

Actual:
Displays loading screen for several minutes. Returns to home screen without showing error message.