Chart: color cannot be null, fix bug on edit, move & remove of device_feature

[Pierre-Gilles]

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Description of change

Fix #2189

[cloudflare-workers-and-pages]

Deploying gladys-plus with    Cloudflare Pages

Latest commit:	16d43c6
Status:	✅  Deploy successful!
Preview URL:	https://1c258ce1.gladys-plus.pages.dev
Branch Preview URL:	https://fix-default-color-bug-chart.gladys-plus.pages.dev

View logs

[relativeci]

#2954 Bundle Size — 10.41MiB (~+0.01%).

16d43c6(current) vs 04c1528 master#2952(baseline)

Warning

Bundle contains 3 duplicate packages – View duplicate packages

Bundle metrics   1 change 1 regression

	Current #2954	Baseline #2952
Initial JS	5.64MiB(+0.01%)	5.64MiB
Initial CSS	304.89KiB	304.89KiB
Cache Invalidation	54.07%	54.07%
Chunks	51	51
Assets	173	173
Modules	1511	1511
Duplicate Modules	21	21
Duplicate Code	0.83%	0.83%
Packages	124	124
Duplicate Packages	3	3

Bundle size by type   1 change 1 regression

	Current #2954	Baseline #2952
JS	7.43MiB (~+0.01%)	7.43MiB
IMG	2.54MiB	2.54MiB
CSS	321.79KiB	321.79KiB
Fonts	93.55KiB	93.55KiB
Other	17.79KiB	17.79KiB
HTML	13.58KiB	13.58KiB

Bundle analysis report Branch fix-default-color-bug-chart Project dashboard

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[Terdious]

I tested in real and debug to observe the behavior it seems very good to me. No more problem when changing the 1st color, and when the same color is selected several times.
The bug of the issue, which was presented at the creation is not present (but for my part, by following the issue I had not managed to reproduce it ... ^^

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.53%. Comparing base (6326203) to head (16d43c6).
Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2201   +/-   ##
=======================================
  Coverage   98.53%   98.53%           
=======================================
  Files         876      876           
  Lines       14432    14432           
=======================================
  Hits        14221    14221           
  Misses        211      211           

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