Show error message from backend on CTD save

[taki9]

No description provided.

[sensenet]

Site name	Url	Last deploy
sn-react-component-docs-dev	https://6054a77df8f44822a8292cb8--sn-react-component-docs-dev.netlify.app	Fri Mar 19 2021 - 13:30:38 GMT+0000 (Coordinated Universal Time)
sn-app-dev	https://6054a77a766225238187545d--sn-app-dev.netlify.app	Fri Mar 19 2021 - 13:30:36 GMT+0000 (Coordinated Universal Time)

[codecov]

Codecov Report

Merging #1248 (e9337e2) into develop (5fc068e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #1248   +/-   ##
========================================
  Coverage    93.77%   93.77%           
========================================
  Files          232      232           
  Lines         6585     6585           
  Branches      1685     1685           
========================================
  Hits          6175     6175           
  Misses         410      410           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 5fc068e...e9337e2. Read the comment docs.