Handle rich text editor content error

[dominik-zeglen]

I want to merge this change because it fixes #356

Screenshots

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 #395 into master will decrease coverage by <.01%.
The diff coverage is 60%.

@@            Coverage Diff             @@
##           master     #395      +/-   ##
==========================================
- Coverage   72.53%   72.52%   -0.01%     
==========================================
  Files         639      639              
  Lines        7122     7124       +2     
  Branches     1181     1181              
==========================================
+ Hits         5166     5167       +1     
- Misses       1718     1719       +1     
  Partials      238      238

Impacted Files	Coverage Δ
src/components/RichTextEditor/RichTextEditor.tsx	73.33% <60%> (-3.59%)	⬇️

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