Fix two stale reads in CreateElements

Closes #509 (closed) and #510 (closed)

assigned to @babadie and unassigned @erwanrouchet

Codecov Report

Merging #1049 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1049   +/-   ##
=======================================
  Coverage   87.87%   87.87%           
=======================================
  Files         235      235           
  Lines       15187    15187           
=======================================
  Hits        13346    13346           
  Misses       1841     1841           

Impacted Files	Coverage Δ
arkindex/documents/api/elements.py	98.78% <ø> (ø)

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mentioned in commit bd12a522

merged