Exception 'SpectrumNode' object has no attribute '_get_rpc'

At login attempt I get above Server Error. Login not possible.

Details
version: v2.0.2
Traceback (most recent call last):
File "flask/app.py", line 1523, in full_dispatch_request
File "flask/app.py", line 1509, in dispatch_request
File "cryptoadvance/specter/server_endpoints/auth.py", line 37, in login
File "cryptoadvance/specter/server_endpoints/auth.py", line 84, in login_method_rpcpasswordaspin
AttributeError: 'SpectrumNode' object has no attribute '_get_rpc'

Steps to reproduce the behavior:
1. Start AppImage
2. Try to login
3. See error

I expect a normal login.

Node running on Raspiblitz.
Spectrum addon activated in Specter
Debian
Chrome
Specter 2.0.2

Start in cryptoadvance/specter/server_endpoints/auth.py, especially login and login_method_rpcpasswordaspin, and trace how SpectrumNode is supplied for the Raspiblitz setup. Reproduce the AppImage login failure on Specter v2.0.2 and inspect the referenced _get_rpc call. Done means login completes for a Spectrum-enabled node and the failure has a regression check if the repository has a suitable test location.

Written by the indexing model from the issue text.