account: do not try to decode "None" as UTF-8

[AymericDu]

SUMMARY

Do not try to decode "None" as UTF-8. This error was frequent but unfortunately it was ignored by our tests.

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

• account

SDS VERSION

openio 7.0.2.dev13

[codecov-commenter]

Codecov Report

Merging #2074 into 7.x will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              7.x    #2074      +/-   ##
==========================================
- Coverage   78.45%   78.42%   -0.02%     
==========================================
  Files         378      378              
  Lines       73564    73565       +1     
  Branches     6571     6571              
==========================================
- Hits        57708    57689      -19     
- Misses      15651    15671      +20     
  Partials      205      205              

Impacted Files	Coverage Δ
oio/account/backend.py	67.82% <100.00%> (-0.48%)	⬇️
tests/functional/content/test_service_id.py	78.83% <0.00%> (-5.88%)	⬇️
oio/common/easy_value.py	84.49% <0.00%> (-5.17%)	⬇️
metautils/lib/volume_lock.c	70.74% <0.00%> (-4.87%)	⬇️
tests/functional/audit/test_audit_storage.py	84.68% <0.00%> (-4.03%)	⬇️
oio/common/utils.py	67.38% <0.00%> (-2.43%)	⬇️
rdir/routes.c.rl	97.88% <0.00%> (-2.12%)	⬇️
tests/functional/cli/admin/test_item_check.py	70.26% <0.00%> (-2.05%)	⬇️
oio/content/plain.py	74.14% <0.00%> (-1.72%)	⬇️
meta1v2/meta1_server.c	69.68% <0.00%> (-1.63%)	⬇️
... and 39 more

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