fix: enhance dead cell_outputs count query

[zmcNotafraid]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 16.66667% with 5 lines in your changes missing coverage. Please review.

Project coverage is 60.21%. Comparing base (f373f6b) to head (5d9437e).
Report is 508 commits behind head on develop.

Files with missing lines	Patch %	Lines
app/models/cell_output.rb	25.00%	3 Missing ⚠️
app/services/charts/block_statistic_generator.rb	0.00%	2 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (f373f6b) and HEAD (5d9437e). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (f373f6b)	HEAD (5d9437e)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2213      +/-   ##
===========================================
- Coverage    67.56%   60.21%   -7.35%     
===========================================
  Files          289      355      +66     
  Lines         7944    10172    +2228     
===========================================
+ Hits          5367     6125     +758     
- Misses        2577     4047    +1470     

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