Fix #7141 - Wrong conversion of to a boolean value

[agigleux]

I replace all occurrences of:

const hasError = error && error !== null;

by

const hasError = Boolean(error);

yarn test:unit: OK
yarn test:front: OK

[soupette]

LGTM

[HichamELBSI]

LGTM

[codecov]

Codecov Report

Merging #7161 into master will decrease coverage by 0.00%.
The diff coverage is 14.28%.

@@            Coverage Diff             @@
##           master    #7161      +/-   ##
==========================================
- Coverage   26.23%   26.22%   -0.01%     
==========================================
  Files        1131     1131              
  Lines       15431    15433       +2     
  Branches     2442     2438       -4     
==========================================
  Hits         4048     4048              
- Misses       9564     9569       +5     
+ Partials     1819     1816       -3     

Flag	Coverage Δ
#front	18.26% <14.28%> (-0.01%)	⬇️
#unit	53.14% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
.../admin/src/components/InputJSONWithErrors/index.js	0.00% <0.00%> (ø)
...ent-manager/admin/src/components/InputUID/index.js	0.00% <0.00%> (ø)
...-manager/admin/src/components/Wysiwyg/constants.js	0.00% <ø> (ø)
...nt-manager/admin/src/components/Wysiwyg/helpers.js	0.00% <0.00%> (ø)
...tent-manager/admin/src/components/Wysiwyg/index.js	0.00% <0.00%> (ø)
...er/admin/src/components/WysiwygWithErrors/index.js	0.00% <0.00%> (ø)
...iners/HomePage/HomePageContent/HomePageSettings.js	0.00% <ø> (ø)
...rapi-plugin-upload/admin/src/translations/index.js	0.00% <ø> (ø)
...dmin/admin/src/components/Webhooks/Inputs/index.js	54.54% <100.00%> (ø)

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