Fix some cartouche icon problems

[balazsbajorics]

Problem:

some array literals were shown with the broken image icon

and

directly after insertion, we'd show a broken image icon for a bit and then show the real icon

Commit Details:

• For "unknown" data, Instead of ever again showing the broken image icon, show a 12x12 invisible div, so the cartouche layout doesn't fall apart and we are not showing ? or anything that would look weird on video or screenshots
• Actually for array literals such as [1, 2, 3] do not show the 'unknown' icon because we know this to be an array!

Fixes #5960

[github-actions]

Try me

[relativeci]

#13090 Bundle Size — 62.22MiB (~+0.01%).

09a61f9(current) vs 6339ece master#13086(baseline)

Warning

Bundle contains 51 duplicate packages – View duplicate packages

Bundle metrics   2 changes 1 regression

	Current #13090	Baseline #13086
Initial JS	45.28MiB(~+0.01%)	45.28MiB
Initial CSS	0B	0B
Cache Invalidation	21.56%	21.54%
Chunks	30	30
Assets	33	33
Modules	4302	4302
Duplicate Modules	523	523
Duplicate Code	31.84%	31.84%
Packages	448	448
Duplicate Packages	51	51

Bundle size by type   2 changes 1 regression 1 improvement

	Current #13090	Baseline #13086
JS	62.21MiB (~+0.01%)	62.21MiB
HTML	11.16KiB (-0.33%)	11.2KiB

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Bundle analysis report Branch fix/cartouche-icon-problems Project dashboard