Hide variants and attributes if product has none

[dominik-zeglen]

I want to merge this change because it keeps dashboard up to date with designs.

Pull Request Checklist

1. All visible strings are translated with proper context.
2. All data-formatting is locale-aware (dates, numbers, and so on).
3. Translated strings are extracted to .pot file.
4. Number of API calls is optimized.
5. The changes are tested.
6. Type definitions are up to date.
7. Changes are mentioned in the changelog.

[codecov]

Codecov Report

Merging #179 into master will increase coverage by 0.02%.
The diff coverage is 71.42%.

@@            Coverage Diff            @@
##           master    #179      +/-   ##
=========================================
+ Coverage   73.27%   73.3%   +0.02%     
=========================================
  Files         538     538              
  Lines        5467    5472       +5     
  Branches      943     947       +4     
=========================================
+ Hits         4006    4011       +5     
+ Misses       1297    1296       -1     
- Partials      164     165       +1

Impacted Files	Coverage Δ
...c/storybook/stories/products/ProductCreatePage.tsx	25% <ø> (ø)	⬆️
...components/ProductCreatePage/ProductCreatePage.tsx	92.3% <0%> (-3.7%)	⬇️
...c/storybook/stories/products/ProductUpdatePage.tsx	57.89% <100%> (+7.89%)	⬆️
...components/ProductUpdatePage/ProductUpdatePage.tsx	93.93% <100%> (+0.18%)	⬆️
...cts/components/ProductVariants/ProductVariants.tsx	54.16% <66.66%> (+4.16%)	⬆️

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