Return None user info if no id_token

[maximlt]

To fix an error I've seen in a test suite after upgrading to Panel 1.3.0

[2023-10-26T10:12:07.721Z] /usr/local/lib/python3.10/site-packages/panel/util/__init__.py:282: in decode_token
[2023-10-26T10:12:07.721Z]     if signed and "." in token:
[2023-10-26T10:12:07.721Z] E   TypeError: argument of type 'NoneType' is not iterable

[codecov]

Codecov Report

Merging #5747 (5a4d2e8) into main (49e1cd6) will increase coverage by 1.79%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##             main    #5747      +/-   ##
==========================================
+ Coverage   82.23%   84.02%   +1.79%     
==========================================
  Files         289      289              
  Lines       42111    42113       +2     
==========================================
+ Hits        34630    35386     +756     
+ Misses       7481     6727     -754     

Flag	Coverage Δ
ui-tests	40.71% <33.33%> (+2.43%)	⬆️
unitexamples-tests	73.67% <33.33%> (+0.23%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
panel/util/__init__.py	89.19% <100.00%> (+5.22%)	⬆️
panel/io/state.py	72.15% <0.00%> (+1.35%)	⬆️

... and 23 files with indirect coverage changes

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[philippjfr]

Thanks!