Various fixes for ReactiveHTML children

[philippjfr]

No description provided.

[codecov]

Codecov Report

Merging #2092 (82d7f94) into master (e8bfce7) will decrease coverage by 0.02%.
The diff coverage is 61.90%.

@@            Coverage Diff             @@
##           master    #2092      +/-   ##
==========================================
- Coverage   84.44%   84.42%   -0.03%     
==========================================
  Files         180      180              
  Lines       21118    21135      +17     
==========================================
+ Hits        17834    17843       +9     
- Misses       3284     3292       +8     

Impacted Files	Coverage Δ
panel/pane/base.py	88.78% <36.36%> (-2.77%)	⬇️
panel/reactive.py	77.22% <90.00%> (+0.09%)	⬆️

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