Workaround TypeError for non-string json keys

[Liam-Deacon]

PR to address #2464

[codecov]

Codecov Report

Merging #2465 (45b0887) into master (fbb52a9) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2465      +/-   ##
==========================================
- Coverage   83.26%   83.26%   -0.01%     
==========================================
  Files         184      184              
  Lines       23040    23040              
==========================================
- Hits        19185    19184       -1     
- Misses       3855     3856       +1     

Impacted Files	Coverage Δ
panel/pane/plotly.py	84.45% <100.00%> (ø)
panel/tests/pane/test_plotly.py	98.10% <0.00%> (-0.64%)	⬇️

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[philippjfr]

Thanks @Liam-Deacon!