Allow an element's parent field to be set to null

Related to frontend#231 (closed)

added 3 commits

• fe4d5322...0b986a5b - 2 commits from branch master
• cdac3aca - Allow an element's parent field to be set to null

Compare with previous version

changed the description

assigned to @babadie and unassigned @erwanrouchet

Codecov Report

Merging #767 into master will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #767   +/-   ##
=======================================
  Coverage   86.29%   86.29%           
=======================================
  Files         200      200           
  Lines       13401    13401           
=======================================
  Hits        11565    11565           
  Misses       1836     1836           

Impacted Files	Coverage Δ
arkindex/documents/tests/test_elements_api.py	100.00% <ø> (ø)
arkindex/documents/serializers/elements.py	97.94% <100.00%> (ø)

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mentioned in merge request frontend!577 (merged)

merged

mentioned in commit 90b82e82