Added check for bool in parse_query

[hoxbro]

Fixes #2758

TODO:

• Write/update a unittest

[codecov]

Codecov Report

Merging #2759 (ae81ad0) into master (80a66c3) will increase coverage by 0.63%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2759      +/-   ##
==========================================
+ Coverage   82.03%   82.66%   +0.63%     
==========================================
  Files         187      188       +1     
  Lines       23963    24056      +93     
==========================================
+ Hits        19658    19887     +229     
+ Misses       4305     4169     -136     

Impacted Files	Coverage Δ
panel/tests/test_util.py	100.00% <100.00%> (ø)
panel/util.py	82.78% <100.00%> (+1.38%)	⬆️
panel/tests/command/test_serve.py	85.00% <0.00%> (ø)
panel/tests/conftest.py	95.90% <0.00%> (+0.21%)	⬆️
panel/pane/holoviews.py	79.65% <0.00%> (+0.21%)	⬆️
panel/pane/vtk/vtk.py	96.83% <0.00%> (+0.45%)	⬆️
panel/pane/plot.py	59.69% <0.00%> (+0.51%)	⬆️
panel/pane/vega.py	82.64% <0.00%> (+0.82%)	⬆️
panel/io/callbacks.py	68.00% <0.00%> (+1.00%)	⬆️
... and 9 more

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[philippjfr]

Thanks @hoxbro !