JSON editor skeleton and empty states

[fiskus]

[codecov[bot]]

Codecov Report

Merging #2629 (93126a4) into master (e39dc3d) will decrease coverage by 0.02%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #2629      +/-   ##
==========================================
- Coverage   35.49%   35.47%   -0.03%     
==========================================
  Files         641      641              
  Lines       28320    28336      +16     
  Branches     4131     4136       +5     
==========================================
  Hits        10053    10053              
- Misses      17091    17105      +14     
- Partials     1176     1178       +2     

Flag	Coverage Δ
api-python	90.72% <ø> (ø)
catalog	8.09% <0.00%> (-0.01%)	:arrow_down:
lambda	86.05% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
catalog/app/components/JsonEditor/EmptyRow.tsx	0.00% <0.00%> (ø)
catalog/app/components/JsonEditor/JsonEditor.tsx	0.00% <0.00%> (ø)
catalog/app/containers/StoryBook/JsonEditor.tsx	0.00% <0.00%> (ø)

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[fiskus]

Applied suggested changes, thanks