Added placeholder to on_change for quill.ts

[hoxbro]

Fixes #3425

Peek.2022-04-18.19-22.mp4

[codecov]

Codecov Report

Merging #3427 (26cf0e8) into master (b9c01ad) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3427   +/-   ##
=======================================
  Coverage   82.92%   82.92%           
=======================================
  Files         198      198           
  Lines       26999    26999           
=======================================
  Hits        22390    22390           
  Misses       4609     4609           

Impacted Files	Coverage Δ
panel/layout/base.py	90.81% <0.00%> (ø)
panel/layout/card.py	96.36% <0.00%> (ø)
panel/layout/flex.py	95.83% <0.00%> (ø)
panel/layout/grid.py	74.92% <0.00%> (ø)
panel/layout/tabs.py	88.28% <0.00%> (ø)
panel/layout/spacer.py	74.07% <0.00%> (ø)
panel/layout/__init__.py	100.00% <0.00%> (ø)
panel/layout/accordion.py	89.79% <0.00%> (ø)
panel/layout/gridstack.py	52.54% <0.00%> (ø)

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[philippjfr]

Thanks @hoxbro !