Gracefully handle non-decodable access_token

[philippjfr]

Fixes #5978

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (573497c) 84.65% compared to head (2b8506f) 84.37%.
Report is 4 commits behind head on main.

Files	Patch %	Lines
panel/io/state.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5994      +/-   ##
==========================================
- Coverage   84.65%   84.37%   -0.28%     
==========================================
  Files         291      291              
  Lines       43458    43461       +3     
==========================================
- Hits        36788    36672     -116     
- Misses       6670     6789     +119     

Flag	Coverage Δ
ui-tests	40.80% <0.00%> (-0.02%)	⬇️
unitexamples-tests	72.47% <0.00%> (-0.26%)	⬇️

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