fix: Make sure len([BODY]) works if the body is a JSON array

[TwiN]

Summary

Fixes #359

Checklist

• Tested and/or added tests to validate that the changes work as intended, if applicable.
• Added the documentation in README.md, if applicable.

[codecov-commenter]

Codecov Report

Base: 82.60% // Head: 82.65% // Increases project coverage by +0.05% 🎉

Coverage data is based on head (189a44e) compared to base (ed3683c).
Patch coverage: 55.55% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #360      +/-   ##
==========================================
+ Coverage   82.60%   82.65%   +0.05%     
==========================================
  Files          54       54              
  Lines        3990     3996       +6     
==========================================
+ Hits         3296     3303       +7     
+ Misses        541      540       -1     
  Partials      153      153              

Impacted Files	Coverage Δ
jsonpath/jsonpath.go	92.04% <55.55%> (-1.86%)	⬇️
config/maintenance/maintenance.go	100.00% <0.00%> (+3.79%)	⬆️

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