Do not error on deserialization errors in notebooks

[philippjfr]

In the notebook where the errors appear inline the deserialization errors should not trigger tracebacks as the user likely can't do anything about them.

[codecov]

Codecov Report

Merging #4927 (e6e2570) into main (95bdcb2) will decrease coverage by 0.04%.
The diff coverage is 12.50%.

@@            Coverage Diff             @@
##             main    #4927      +/-   ##
==========================================
- Coverage   83.43%   83.40%   -0.04%     
==========================================
  Files         270      270              
  Lines       38171    38175       +4     
==========================================
- Hits        31849    31839      -10     
- Misses       6322     6336      +14     

Flag	Coverage Δ
ui-tests	40.84% <12.50%> (-0.05%)	⬇️
unitexamples-tests	73.39% <12.50%> (+0.01%)	⬆️

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Impacted Files	Coverage Δ
panel/viewable.py	65.45% <12.50%> (-0.40%)	⬇️

... and 4 files with indirect coverage changes

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