Follow up on #830

[mwouts]

With this PR we resolve the three comments at #830

[codecov]

Codecov Report

Merging #845 (23d28d3) into master (bd776a5) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #845   +/-   ##
=======================================
  Coverage   99.11%   99.11%           
=======================================
  Files         106      106           
  Lines       10342    10345    +3     
=======================================
+ Hits        10250    10253    +3     
  Misses         92       92           

Impacted Files	Coverage Δ
jupytext/config.py	97.43% <ø> (-0.02%)	⬇️
jupytext/contentsmanager.py	97.88% <100.00%> (+0.03%)	⬆️

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