Improve command add jsondecodeerror

[LePetitTim]

No description provided.

[codecov]

Codecov Report

Merging #190 (f647551) into master (c2def4e) will increase coverage by 0.15%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #190      +/-   ##
==========================================
+ Coverage   98.59%   98.74%   +0.15%     
==========================================
  Files         156      156              
  Lines        5254     5277      +23     
==========================================
+ Hits         5180     5211      +31     
+ Misses         74       66       -8     

Impacted Files	Coverage Δ
...viere/observations/management/commands/__init__.py	97.95% <100.00%> (+20.45%)	⬆️
...nagement/commands/import_hydrobiologie_stations.py	100.00% <100.00%> (ø)
...s/management/commands/import_pcquality_stations.py	100.00% <100.00%> (ø)

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