Config sheet: Properly handle null as configuration value

[florian-h05]

This fixes an error that was previously thrown.

backend.js:5526 TypeError: Cannot read properties of null (reading 'toString')
    at eval (index.js??vue-loader-options!./src/components/config/config-sheet.vue?vue&type=script&lang=js:57:133)
    at Array.filter (<anonymous>)
    at VueComponent.displayedParameters (index.js??vue-loader-options!./src/components/config/config-sheet.vue?vue&type=script&lang=js:56:30)
    at Watcher.get (vue.esm.js:4223:33)
    at Watcher.evaluate (vue.esm.js:4324:27)
    at VueComponent.computedGetter [as displayedParameters] (vue.esm.js:4547:25)
    at Object.get (vue.esm.js:771:26)
    at Proxy.render (templateLoader.js??ruleSet[1].rules[2]!./node_modules/vue-loader/lib/index.js??vue-loader-options!./src/components/config/config-sheet.vue?vue&type=template&id=23208b3e:34:11)
    at Vue._render (vue.esm.js:2591:28)
    at VueComponent.updateComponent (vue.esm.js:3137:27)

[relativeci]

#2290 Bundle Size — 10.82MiB (~+0.01%).

9e89c15(current) vs e742d7a main#2286(baseline)

Warning

Bundle contains 2 duplicate packages – View duplicate packages

Bundle metrics   2 changes 1 regression

	Current #2290	Baseline #2286
Initial JS	1.89MiB(~+0.01%)	1.89MiB
Initial CSS	576.5KiB	576.5KiB
Cache Invalidation	19.19%	18.15%
Chunks	226	226
Assets	249	249
Modules	2920	2920
Duplicate Modules	149	149
Duplicate Code	1.8%	1.8%
Packages	96	96
Duplicate Packages	2	2

Bundle size by type   1 change 1 regression

	Current #2290	Baseline #2286
JS	9.04MiB (~+0.01%)	9.04MiB
CSS	863.22KiB	863.22KiB
Fonts	526.1KiB	526.1KiB
Media	295.6KiB	295.6KiB
IMG	140.74KiB	140.74KiB
HTML	1.39KiB	1.39KiB
Other	871B	871B

Bundle analysis report Branch florian-h05:config-sheet-null Project dashboard

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